ArgumentError: The scope body needs to be callable.

[mtolava]

Hello. I have an issue when trying install the plugin in redmine 3.
This is my configuratation

Environment:
Redmine version 3.0.1.stable
Ruby version 2.2.4-p230 (2015-12-16) [i686-linux]
Rails version 4.2.0
Environment production
Database adapter Mysql2
SCM:
Subversion 1.8.8
Git 1.9.1
Filesystem
Redmine plugins:
redmine_planning 1.0.0

My database is MySQL 5.5.54 (im tested in Mysql 5.7.17 too, with the same result)
Im using the version feature/redmine3 (and intented too with v1.0.6, with the same result)
Im working with RVM, This is the gems in this gemset:

actionmailer (4.2.0)
actionpack (4.2.0)
actionpack-action_caching (1.2.0)
actionpack-xml_parser (1.0.2)
actionview (4.2.0)
activejob (4.2.0)
activemodel (4.2.0)
activerecord (4.2.0)
activesupport (4.2.0)
arel (6.0.4)
bigdecimal (1.2.6)
builder (3.2.3)
bundle (0.0.1)
bundler (1.14.6)
bundler-unload (1.0.2)
coderay (1.1.1)
concurrent-ruby (1.0.5)
daemons (1.2.4)
erubis (2.7.0)
eventmachine (1.2.3)
executable-hooks (1.3.2)
gem-wrappers (1.2.7)
globalid (0.4.0)
holidays (1.0.8)
htmlentities (4.3.1)
i18n (0.8.1)
icalendar (2.4.1)
io-console (0.4.3)
jquery-rails (3.1.4)
json (1.8.6, 1.8.1)
loofah (2.0.3)
mail (2.6.4)
mime-types (3.1)
mime-types-data (3.2016.0521)
mini_portile2 (2.1.0)
minitest (5.10.1, 5.4.3)
mysql2 (0.3.14)
net-ldap (0.3.1)
nokogiri (1.7.1)
open-uri-cached (0.0.5)
pdf-core (0.7.0)
power_assert (0.2.2)
prawn (2.2.2)
protected_attributes (1.1.3)
psych (2.0.8)
rack (1.6.5)
rack-openid (1.4.2)
rack-test (0.6.3)
rails (4.2.0)
rails-deprecated_sanitizer (1.0.3)
rails-dom-testing (1.0.8)
rails-html-sanitizer (1.0.3)
railties (4.2.0)
rake (12.0.0, 10.4.2)
rbpdf (1.18.7)
rdoc (4.2.0)
redcarpet (3.1.2)
request_store (1.0.5)
rmagick (2.16.0)
ruby-openid (2.3.0)
rubygems-bundler (1.4.4)
rvm (1.11.3.9)
sprockets (3.7.1)
sprockets-rails (3.2.0)
test-unit (3.0.8)
thin (1.7.0)
thor (0.19.4)
thread_safe (0.3.6)
ttfunk (1.5.1)
tzinfo (1.2.3)

The trace of the error is this

$ RAILS_ENV=production rake redmine:plugins:migrate rake aborted! ArgumentError: The scope body needs to be callable. /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activerecord-4.2.0/lib/active_record/scoping/named.rb:143:in scope'
/var/www/mendoza/redmine/plugins/redmine_backlogs/app/models/rb_release.rb:174:in class:RbRelease'
/var/www/mendoza/redmine/plugins/redmine_backlogs/app/models/rb_release.rb:156:in <top (required)>' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in require'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in block in require' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in load_dependency'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in require' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:360:in require_or_load'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:494:in load_missing_constant' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:184:in const_missing'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:526:in load_missing_constant' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:184:in const_missing'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:526:in load_missing_constant' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:184:in const_missing'
/var/www/mendoza/redmine/plugins/redmine_backlogs/lib/backlogs_project_patch.rb:176:in block in included' /var/www/mendoza/redmine/plugins/redmine_backlogs/lib/backlogs_project_patch.rb:174:in class_eval'
/var/www/mendoza/redmine/plugins/redmine_backlogs/lib/backlogs_project_patch.rb:174:in included' /var/www/mendoza/redmine/plugins/redmine_backlogs/lib/backlogs_project_patch.rb:346:in include'
/var/www/mendoza/redmine/plugins/redmine_backlogs/lib/backlogs_project_patch.rb:346:in <top (required)>' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in require'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in block in require' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in load_dependency'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in require' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:360:in require_or_load'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:317:in depend_on' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:233:in require_dependency'
/var/www/mendoza/redmine/plugins/redmine_backlogs/init.rb:32:in block in <top (required)>' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:441:in instance_exec'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:441:in block in make_lambda' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:189:in call'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:189:in block in simple' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:190:in call'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:190:in block in simple' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:92:in call'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:92:in _run_callbacks' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:734:in _run_prepare_callbacks'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:81:in run_callbacks' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/actionpack-4.2.0/lib/action_dispatch/middleware/reloader.rb:83:in prepare!'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/actionpack-4.2.0/lib/action_dispatch/middleware/reloader.rb:55:in prepare!' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/railties-4.2.0/lib/rails/application/finisher.rb:50:in block in module:Finisher'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/railties-4.2.0/lib/rails/initializable.rb:30:in instance_exec' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/railties-4.2.0/lib/rails/initializable.rb:30:in run'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/railties-4.2.0/lib/rails/initializable.rb:55:in block in run_initializers' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/railties-4.2.0/lib/rails/initializable.rb:54:in run_initializers'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/railties-4.2.0/lib/rails/application.rb:352:in initialize!' /var/www/mendoza/redmine/config/environment.rb:14:in <top (required)>'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/railties-4.2.0/lib/rails/application.rb:328:in require' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/railties-4.2.0/lib/rails/application.rb:328:in require_environment!'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/railties-4.2.0/lib/rails/application.rb:443:in block in run_tasks_blocks' /usr/local/rvm/gems/ruby-2.2.4@mendoza/gems/rake-12.0.0/exe/rake:27:in <top (required)>'
/usr/local/rvm/gems/ruby-2.2.4@mendoza/bin/ruby_executable_hooks:15:in eval' /usr/local/rvm/gems/ruby-2.2.4@mendoza/bin/ruby_executable_hooks:15:in

'
Tasks: TOP => redmine:plugins:migrate => environment
(See full trace by running task with --trace)
`

Somebody resolve this error?

[mtolava]

Use https://github.com/fredsdc/redmine_backlogs and works

[hxqqqqqq]

this is my errors:
bash-4.1# bundle exec rake redmine:backlogs:install
rake aborted!
LoadError: No such file to load -- prawn
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:274:in require' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:274:in block in require'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:240:in load_dependency' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:274:in require'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/plugins/redmine_backlogs/lib/backlogs_printable_cards.rb:2:in <top (required)>' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:274:in require'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:274:in block in require' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:240:in load_dependency'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:274:in require' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:360:in require_or_load'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:317:in depend_on' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:233:in require_dependency'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/plugins/redmine_backlogs/init.rb:45:in block in <top (required)>' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:446:in instance_exec'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:446:in block in make_lambda' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:192:in block in simple'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:504:in block in call' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:504:in each'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:504:in call' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:92:in run_callbacks'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:778:in _run_prepare_callbacks' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:81:in run_callbacks'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/reloader.rb:83:in prepare!' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/reloader.rb:55:in prepare!'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/application/finisher.rb:50:in block in <module:Finisher>' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/initializable.rb:30:in instance_exec'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/initializable.rb:30:in run' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/initializable.rb:55:in block in run_initializers'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/initializable.rb:54:in run_initializers' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/application.rb:352:in initialize!'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/config/environment.rb:14:in <top (required)>' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/application.rb:328:in require'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/application.rb:328:in require_environment!' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/application.rb:457:in block in run_tasks_blocks'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/exe/rake:27:in <top (required)>' /opt/redmine-3.4.5-0/ruby/bin/bundle:23:in load'
/opt/redmine-3.4.5-0/ruby/bin/bundle:23:in `

'
Tasks: TOP => redmine:backlogs:install => environment
(See full trace by running task with --trace)

please help me.tkx.

[hxqqqqqq]

bash-4.1# bundle exec rake db:migrate --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
rake aborted!
LoadError: No such file to load -- prawn
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:274:in require' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:274:in block in require'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:240:in load_dependency' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:274:in require'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/plugins/redmine_backlogs/lib/backlogs_printable_cards.rb:2:in <top (required)>' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:274:in require'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:274:in block in require' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:240:in load_dependency'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:274:in require' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:360:in require_or_load'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:317:in depend_on' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/dependencies.rb:233:in require_dependency'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/plugins/redmine_backlogs/init.rb:45:in block in <top (required)>' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:446:in instance_exec'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:446:in block in make_lambda' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:192:in block in simple'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:504:in block in call' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:504:in each'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:504:in call' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:92:in run_callbacks'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:778:in _run_prepare_callbacks' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:81:in run_callbacks'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/reloader.rb:83:in prepare!' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/actionpack-4.2.8/lib/action_dispatch/middleware/reloader.rb:55:in prepare!'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/application/finisher.rb:50:in block in <module:Finisher>' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/initializable.rb:30:in instance_exec'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/initializable.rb:30:in run' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/initializable.rb:55:in block in run_initializers'
/opt/redmine-3.4.5-0/ruby/lib/ruby/2.3.0/tsort.rb:228:in block in tsort_each' /opt/redmine-3.4.5-0/ruby/lib/ruby/2.3.0/tsort.rb:350:in block (2 levels) in each_strongly_connected_component'
/opt/redmine-3.4.5-0/ruby/lib/ruby/2.3.0/tsort.rb:431:in each_strongly_connected_component_from' /opt/redmine-3.4.5-0/ruby/lib/ruby/2.3.0/tsort.rb:349:in block in each_strongly_connected_component'
/opt/redmine-3.4.5-0/ruby/lib/ruby/2.3.0/tsort.rb:347:in each' /opt/redmine-3.4.5-0/ruby/lib/ruby/2.3.0/tsort.rb:347:in call'
/opt/redmine-3.4.5-0/ruby/lib/ruby/2.3.0/tsort.rb:347:in each_strongly_connected_component' /opt/redmine-3.4.5-0/ruby/lib/ruby/2.3.0/tsort.rb:226:in tsort_each'
/opt/redmine-3.4.5-0/ruby/lib/ruby/2.3.0/tsort.rb:205:in tsort_each' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/initializable.rb:54:in run_initializers'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/application.rb:352:in initialize!' /opt/redmine-3.4.5-0/apps/redmine/htdocs/config/environment.rb:14:in <top (required)>'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/application.rb:328:in require' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/application.rb:328:in require_environment!'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/railties-4.2.8/lib/rails/application.rb:457:in block in run_tasks_blocks' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:271:in block in execute'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:271:in each' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:271:in execute'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:213:in block in invoke_with_call_chain' /opt/redmine-3.4.5-0/ruby/lib/ruby/2.3.0/monitor.rb:214:in mon_synchronize'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:193:in invoke_with_call_chain' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:237:in block in invoke_prerequisites'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:235:in each' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:235:in invoke_prerequisites'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:212:in block in invoke_with_call_chain' /opt/redmine-3.4.5-0/ruby/lib/ruby/2.3.0/monitor.rb:214:in mon_synchronize'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:193:in invoke_with_call_chain' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/task.rb:182:in invoke'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:160:in invoke_task' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:116:in block (2 levels) in top_level'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:116:in each' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:116:in block in top_level'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:125:in run_with_threads' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:110:in top_level'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:83:in block in run' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:186:in standard_exception_handling'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/lib/rake/application.rb:80:in run' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/gems/rake-12.3.1/exe/rake:27:in <top (required)>'
/opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/bin/rake:23:in load' /opt/redmine-3.4.5-0/apps/redmine/htdocs/vendor/bundle/ruby/2.3.0/bin/rake:23:in <top (required)>'
/opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/cli/exec.rb:74:in load' /opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/cli/exec.rb:74:in kernel_load'
/opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/cli/exec.rb:27:in run' /opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/cli.rb:335:in exec'
/opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/vendor/thor/lib/thor/command.rb:27:in run' /opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in invoke_command'
/opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/vendor/thor/lib/thor.rb:359:in dispatch' /opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/cli.rb:20:in dispatch'
/opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/vendor/thor/lib/thor/base.rb:440:in start' /opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/cli.rb:11:in start'
/opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/exe/bundle:32:in block in <top (required)>' /opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/friendly_errors.rb:121:in with_friendly_errors'
/opt/redmine-3.4.5-0/ruby/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/exe/bundle:24:in <top (required)>' /opt/redmine-3.4.5-0/ruby/bin/bundle:23:in load'
/opt/redmine-3.4.5-0/ruby/bin/bundle:23:in `

'
Tasks: TOP => db:migrate => environment

[hxqqqqqq]

this is another environment:
debian 9.2
ruby 2.3.3p222 (2016-11-21) [x86_64-linux-gnu]
Rails 4.2.7.1
redmine 3.3.5

root@debian:/usr/share/redmine# bundle exec rake redmine:backlogs:install
3.3.1.stable. You are running backlogs v2.0.2, latest version is 2.0.2

=====================================================
Redmine Backlogs Installer

Installing to the production environment.
Fetching card labels from https://git.gnome.org...Skipping malformed label 'Avery L4730' from avery-iso-templates.xml
Skipping malformed label 'Avery L4732' from avery-iso-templates.xml
Skipping malformed label 'Avery L4770' from avery-iso-templates.xml
Skipping malformed label 'Avery L4785' from avery-iso-templates.xml
Skipping malformed label 'Avery 6121' from avery-iso-templates.xml
Skipping malformed label 'Avery 7160' from avery-iso-templates.xml
Skipping malformed label 'Avery 7161' from avery-iso-templates.xml
Skipping malformed label 'Avery 7162' from avery-iso-templates.xml
Skipping malformed label 'Avery 7163' from avery-iso-templates.xml
Skipping malformed label 'Avery 7164' from avery-iso-templates.xml
Skipping malformed label 'Avery 7165' from avery-iso-templates.xml
Skipping malformed label 'Avery 7169' from avery-iso-templates.xml
Skipping malformed label 'Avery 7414' from avery-iso-templates.xml
Skipping malformed label 'Avery 7664' from avery-iso-templates.xml
Skipping malformed label 'Avery J8157' from avery-iso-templates.xml
Skipping malformed label 'Avery 8414' from avery-iso-templates.xml
Skipping malformed label 'Avery 8435A' from avery-iso-templates.xml
Skipping malformed label 'Avery 8435B' from avery-iso-templates.xml
Skipping malformed label 'Avery 8651' from avery-iso-templates.xml
Skipping malformed label 'Avery 8658' from avery-iso-templates.xml
Skipping malformed label 'Avery 8666' from avery-iso-templates.xml
Skipping malformed label 'Avery 18036' from avery-iso-templates.xml
Skipping malformed label 'Avery 32015' from avery-iso-templates.xml
Skipping malformed label 'Avery 38931' from avery-iso-templates.xml
Skipping malformed label 'Avery C32011-10' from avery-iso-templates.xml
Skipping malformed label 'Avery 6141' from avery-other-templates.xml
Skipping malformed label 'Avery 3274.1' from avery-us-templates.xml
Skipping malformed label 'Avery 5026' from avery-us-templates.xml
Skipping malformed label 'Avery 5126' from avery-us-templates.xml
Skipping malformed label 'Avery 5159' from avery-us-templates.xml
Skipping malformed label 'Avery 5160' from avery-us-templates.xml
Skipping malformed label 'Avery 5161' from avery-us-templates.xml
Skipping malformed label 'Avery 5162' from avery-us-templates.xml
Skipping malformed label 'Avery 5163' from avery-us-templates.xml
Skipping malformed label 'Avery 5164' from avery-us-templates.xml
Skipping malformed label 'Avery 5167' from avery-us-templates.xml
Skipping malformed label 'Avery 5168' from avery-us-templates.xml
Skipping malformed label 'Avery 5196' from avery-us-templates.xml
Skipping malformed label 'Avery 5197' from avery-us-templates.xml
Skipping malformed label 'Avery 5305' from avery-us-templates.xml
Skipping malformed label 'Avery 5366' from avery-us-templates.xml
Skipping malformed label 'Avery 5371' from avery-us-templates.xml
Skipping malformed label 'Avery 5388' from avery-us-templates.xml
Skipping malformed label 'Avery 5389' from avery-us-templates.xml
Skipping malformed label 'Avery 5395' from avery-us-templates.xml
Skipping malformed label 'Avery 5663' from avery-us-templates.xml
Skipping malformed label 'Avery 5931-Spine' from avery-us-templates.xml
Skipping malformed label 'Avery 5997-Face' from avery-us-templates.xml
Skipping malformed label 'Avery 5997-Spine' from avery-us-templates.xml
Skipping malformed label 'Avery 6490' from avery-us-templates.xml
Skipping malformed label 'Avery 6570' from avery-us-templates.xml
Skipping malformed label 'Avery 6573' from avery-us-templates.xml
Skipping malformed label 'Avery 6871' from avery-us-templates.xml
Skipping malformed label 'Avery 6873' from avery-us-templates.xml
Skipping malformed label 'Avery 6874' from avery-us-templates.xml
Skipping malformed label 'Avery 6879' from avery-us-templates.xml
Skipping malformed label 'Avery 8165' from avery-us-templates.xml
Skipping malformed label 'Avery 8195' from avery-us-templates.xml
Skipping malformed label 'Avery 8373' from avery-us-templates.xml
Skipping malformed label 'Avery LSK-8' from avery-us-templates.xml
Skipping malformed label 'Avery LSK-8.5' from avery-us-templates.xml
Skipping malformed label 'Avery LSK-5' from avery-us-templates.xml
Skipping malformed label 'Avery LSK-5.5' from avery-us-templates.xml
Skipping malformed label 'Avery LSK-3' from avery-us-templates.xml
Skipping malformed label 'Avery LSK-3.5' from avery-us-templates.xml
Skipping malformed label 'Avery 89101' from avery-us-templates.xml
Skipping malformed label 'Avery 89102' from avery-us-templates.xml
Skipping malformed label 'Avery 89104' from avery-us-templates.xml
Skipping malformed label 'Avery 89106' from avery-us-templates.xml
Skipping malformed label 'Avery 89109' from avery-us-templates.xml
Skipping malformed label 'Brother DK-1201' from brother-other-templates.xml
Skipping malformed label 'Brother DK-1202' from brother-other-templates.xml
Skipping malformed label 'Brother DK-1204' from brother-other-templates.xml
Skipping malformed label 'Brother DK-1208' from brother-other-templates.xml
Skipping malformed label 'Brother DK-11201-old' from brother-other-templates.xml
Skipping malformed label 'Brother DK-11202-old' from brother-other-templates.xml
Skipping malformed label 'Brother DK-11204-old' from brother-other-templates.xml
Skipping malformed label 'Brother DK-11208-old' from brother-other-templates.xml
Skipping malformed label 'Dymo 11352' from dymo-other-templates.xml
Skipping malformed label 'Dymo 11353' from dymo-other-templates.xml
Skipping malformed label 'Dymo 11354' from dymo-other-templates.xml
Skipping malformed label 'Dymo 11355' from dymo-other-templates.xml
Skipping malformed label 'Dymo 11356' from dymo-other-templates.xml
Skipping malformed label 'Dymo 30256' from dymo-other-templates.xml
Skipping malformed label 'Dymo 30327' from dymo-other-templates.xml
Skipping malformed label 'Dymo 30258' from dymo-other-templates.xml
Skipping malformed label 'Dymo 30332' from dymo-other-templates.xml
Skipping malformed label 'Dymo 30374' from dymo-other-templates.xml
Skipping malformed label 'Dymo 30376' from dymo-other-templates.xml
Skipping malformed label 'Dymo 30856' from dymo-other-templates.xml
Skipping malformed label 'Dymo 99010' from dymo-other-templates.xml
Skipping malformed label 'Dymo 99012' from dymo-other-templates.xml
Skipping malformed label 'Dymo 99013' from dymo-other-templates.xml
Skipping malformed label 'Dymo 99014' from dymo-other-templates.xml
Skipping malformed label 'Dymo 99015' from dymo-other-templates.xml
Skipping malformed label 'Dymo 99017' from dymo-other-templates.xml
Skipping malformed label 'Dymo 99019' from dymo-other-templates.xml
Skipping malformed label 'Maco LL5805' from maco-us-templates.xml
Skipping malformed label 'OfficeMax 86112' from misc-other-templates.xml
Skipping malformed label 'Kingdom L' from misc-us-templates.xml
Skipping malformed label 'Neato Slimline CD Case' from misc-us-templates.xml
Skipping malformed label 'Neato Slimline CD Case, spine' from misc-us-templates.xml
Skipping malformed label 'Neato USCD2lbl Rectangles' from misc-us-templates.xml
Skipping malformed label 'Neato 69143' from misc-us-templates.xml
Skipping malformed label 'Netc 749303-70001 ' from misc-us-templates.xml
Skipping malformed label 'OfficeMax OM99060' from misc-us-templates.xml
Skipping malformed label 'Southworth BC554' from misc-us-templates.xml
Skipping malformed label 'Stomper PRO Zip' from misc-us-templates.xml
Skipping malformed label 'Stomper PRO Spine' from misc-us-templates.xml
Skipping malformed label 'Tough-Tags TTLW-2016' from misc-us-templates.xml
Skipping malformed label 'Uline S-5044' from uline-us-templates.xml
Skipping malformed label 'Worldlabel WL-25' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-75' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-100' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-125' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-150' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-157' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-159' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-160' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-161' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-171' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-172' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-175' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-200' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-225' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-250' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-625' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-875' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-1125' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-1150' from worldlabel-us-templates.xml
Skipping malformed label 'Worldlabel WL-5100' from worldlabel-us-templates.xml
Skipping malformed label 'Zweckform 4760' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 4761' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 3477' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 3651' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 3659' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 3669' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 3688' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 4732' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 4746' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 4780' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 3474' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 3475' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 3490' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 4781' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 6091' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 6021' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform J8435A' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform J8435B' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 32010' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 32015' from zweckform-iso-templates.xml
Skipping malformed label 'Zweckform 3348' from zweckform-iso-templates.xml
done!
Configuring epic and task trackers...

Which trackers do you want to use for your epics?

1. Bug
2. Feature
3. Support
4. 测试委托(软件)
5. 测试委托(硬件)
6. 初品委托
   Separate values with a space (e.g. 1 3): 1 2 3
   You selected the following trackers: Bug, Feature, Support. Is this correct? (y/n) y

---

Which trackers do you want to use for your stories?
rake aborted!
NoMethodError: undefined method include?' for nil:NilClass /usr/share/redmine/plugins/redmine_backlogs/lib/tasks/install.rake:134:in block (4 levels) in <top (required)>'
/usr/share/redmine/plugins/redmine_backlogs/lib/tasks/install.rake:134:in block (3 levels) in <top (required)>' /var/lib/gems/2.3.0/gems/rake-12.3.1/exe/rake:27:in <top (required)>'
Tasks: TOP => redmine:backlogs:install
(See full trace by running task with --trace)

[hxqqqqqq]

this is another problem when i re-install the plugin.

root@debian:/usr/share/redmine/plugins/redmine_backlogs# bundle exec rake redmine:backlogs:install
(in /usr/share/redmine)
3.3.1.stable. You are running backlogs v1.0.6, latest version is 1.0.6

=====================================================
Redmine Backlogs Installer

Installing to the production environment.
Fetching card labels from http://git.gnome.org...done!
Story and task trackers are now set.
Migrating the database...rake aborted!
StandardError: An error has occurred, all later migrations canceled:

Mysql2::Error: Duplicate column name 'position': ALTER TABLE issues ADD position int(11)
/var/lib/gems/2.3.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:80:in _query' /var/lib/gems/2.3.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:80:in block in query'
/var/lib/gems/2.3.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:79:in handle_interrupt' /var/lib/gems/2.3.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:79:in query'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:317:in block in execute' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract_adapter.rb:484:in block in log'
/var/lib/gems/2.3.0/gems/activesupport-4.2.10/lib/active_support/notifications/instrumenter.rb:20:in instrument' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract_adapter.rb:478:in log'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:317:in execute' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/mysql2_adapter.rb:217:in execute'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract/schema_statements.rb:407:in add_column' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:665:in block in method_missing'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:634:in block in say_with_time' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:634:in say_with_time'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:654:in method_missing' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:416:in method_missing'
/usr/share/redmine/plugins/redmine_backlogs/db/migrate/011_create_stories_tasks_sprints_and_burndown.rb:3:in up' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:571:in up'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:611:in exec_migration' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:592:in block (2 levels) in migrate'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:591:in block in migrate' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in with_connection'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:590:in migrate' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:768:in migrate'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:1023:in block in execute_migration_in_transaction' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:1071:in ddl_transaction'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:1022:in execute_migration_in_transaction' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:984:in block in migrate'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:980:in each' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:980:in migrate'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:823:in up' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:801:in migrate'
/usr/share/redmine/lib/redmine/plugin.rb:481:in migrate_plugin' /usr/share/redmine/lib/redmine/plugin.rb:453:in migrate'
/usr/share/redmine/lib/redmine/plugin.rb:467:in block in migrate' /usr/share/redmine/lib/redmine/plugin.rb:466:in each'
/usr/share/redmine/lib/redmine/plugin.rb:466:in migrate' /usr/share/redmine/lib/tasks/redmine.rake:127:in block (3 levels) in <top (required)>'
/var/lib/gems/2.3.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'

Caused by:
ActiveRecord::StatementInvalid: Mysql2::Error: Duplicate column name 'position': ALTER TABLE issues ADD position int(11)
/var/lib/gems/2.3.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:80:in _query' /var/lib/gems/2.3.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:80:in block in query'
/var/lib/gems/2.3.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:79:in handle_interrupt' /var/lib/gems/2.3.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:79:in query'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:317:in block in execute' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract_adapter.rb:484:in block in log'
/var/lib/gems/2.3.0/gems/activesupport-4.2.10/lib/active_support/notifications/instrumenter.rb:20:in instrument' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract_adapter.rb:478:in log'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:317:in execute' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/mysql2_adapter.rb:217:in execute'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract/schema_statements.rb:407:in add_column' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:665:in block in method_missing'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:634:in block in say_with_time' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:634:in say_with_time'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:654:in method_missing' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:416:in method_missing'
/usr/share/redmine/plugins/redmine_backlogs/db/migrate/011_create_stories_tasks_sprints_and_burndown.rb:3:in up' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:571:in up'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:611:in exec_migration' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:592:in block (2 levels) in migrate'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:591:in block in migrate' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in with_connection'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:590:in migrate' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:768:in migrate'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:1023:in block in execute_migration_in_transaction' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:1071:in ddl_transaction'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:1022:in execute_migration_in_transaction' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:984:in block in migrate'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:980:in each' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:980:in migrate'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:823:in up' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:801:in migrate'
/usr/share/redmine/lib/redmine/plugin.rb:481:in migrate_plugin' /usr/share/redmine/lib/redmine/plugin.rb:453:in migrate'
/usr/share/redmine/lib/redmine/plugin.rb:467:in block in migrate' /usr/share/redmine/lib/redmine/plugin.rb:466:in each'
/usr/share/redmine/lib/redmine/plugin.rb:466:in migrate' /usr/share/redmine/lib/tasks/redmine.rake:127:in block (3 levels) in <top (required)>'
/var/lib/gems/2.3.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'

Caused by:
Mysql2::Error: Duplicate column name 'position'
/var/lib/gems/2.3.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:80:in _query' /var/lib/gems/2.3.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:80:in block in query'
/var/lib/gems/2.3.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:79:in handle_interrupt' /var/lib/gems/2.3.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:79:in query'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:317:in block in execute' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract_adapter.rb:484:in block in log'
/var/lib/gems/2.3.0/gems/activesupport-4.2.10/lib/active_support/notifications/instrumenter.rb:20:in instrument' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract_adapter.rb:478:in log'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:317:in execute' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/mysql2_adapter.rb:217:in execute'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract/schema_statements.rb:407:in add_column' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:665:in block in method_missing'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:634:in block in say_with_time' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:634:in say_with_time'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:654:in method_missing' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:416:in method_missing'
/usr/share/redmine/plugins/redmine_backlogs/db/migrate/011_create_stories_tasks_sprints_and_burndown.rb:3:in up' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:571:in up'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:611:in exec_migration' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:592:in block (2 levels) in migrate'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:591:in block in migrate' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in with_connection'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:590:in migrate' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:768:in migrate'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:1023:in block in execute_migration_in_transaction' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:1071:in ddl_transaction'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:1022:in execute_migration_in_transaction' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:984:in block in migrate'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:980:in each' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:980:in migrate'
/var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:823:in up' /var/lib/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/migration.rb:801:in migrate'
/usr/share/redmine/lib/redmine/plugin.rb:481:in migrate_plugin' /usr/share/redmine/lib/redmine/plugin.rb:453:in migrate'
/usr/share/redmine/lib/redmine/plugin.rb:467:in block in migrate' /usr/share/redmine/lib/redmine/plugin.rb:466:in each'
/usr/share/redmine/lib/redmine/plugin.rb:466:in migrate' /usr/share/redmine/lib/tasks/redmine.rake:127:in block (3 levels) in <top (required)>'
/var/lib/gems/2.3.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
Tasks: TOP => redmine:plugins:migrate
(See full trace by running task with --trace)
done!
Installation complete. Please restart Redmine.
Thank you for trying out Redmine Backlogs!

[hxqqqqqq]

when i add one story, the error tips:
Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'where id = 14' at line 1: update issues set position = where id = 14
what can i do?who can help me?