NoMethodError: undefined method `each' for nil:NilClass

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NoMethodError: undefined method `each' for nil:NilClass
  File "/var/www/sites/DMPonline_v4/app/controllers/guidances_controller.rb", line 46, in admin_new
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_controller/metal/implicit_render.rb", line 4, in send_action
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/abstract_controller/base.rb", line 167, in process_action
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_controller/metal/rendering.rb", line 10, in process_action
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/abstract_controller/callbacks.rb", line 18, in block in process_action
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/activesupport-3.2.22.5/lib/active_support/callbacks.rb", line 425, in _run__4529520371077515747__process_action__1753863333946113430__callbacks
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/activesupport-3.2.22.5/lib/active_support/callbacks.rb", line 405, in __run_callback
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/activesupport-3.2.22.5/lib/active_support/callbacks.rb", line 385, in _run_process_action_callbacks
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/activesupport-3.2.22.5/lib/active_support/callbacks.rb", line 81, in run_callbacks
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/abstract_controller/callbacks.rb", line 17, in process_action
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_controller/metal/rescue.rb", line 29, in process_action
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_controller/metal/instrumentation.rb", line 30, in block in process_action
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/activesupport-3.2.22.5/lib/active_support/notifications.rb", line 123, in block in instrument
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/activesupport-3.2.22.5/lib/active_support/notifications/instrumenter.rb", line 20, in instrument
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/activesupport-3.2.22.5/lib/active_support/notifications.rb", line 123, in instrument
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_controller/metal/instrumentation.rb", line 29, in process_action
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_controller/metal/params_wrapper.rb", line 207, in process_action
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/activerecord-3.2.22.5/lib/active_record/railties/controller_runtime.rb", line 18, in process_action
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/abstract_controller/base.rb", line 121, in process
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/abstract_controller/rendering.rb", line 46, in process
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_controller/metal.rb", line 203, in dispatch
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_controller/metal/rack_delegation.rb", line 14, in dispatch
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_controller/metal.rb", line 246, in block in action
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_dispatch/routing/route_set.rb", line 73, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_dispatch/routing/route_set.rb", line 73, in dispatch
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_dispatch/routing/route_set.rb", line 36, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/journey-1.0.4/lib/journey/router.rb", line 68, in block in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/journey-1.0.4/lib/journey/router.rb", line 56, in each
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/journey-1.0.4/lib/journey/router.rb", line 56, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_dispatch/routing/route_set.rb", line 608, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/omniauth-1.4.2/lib/omniauth/strategy.rb", line 186, in call!
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/omniauth-1.4.2/lib/omniauth/strategy.rb", line 164, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/omniauth-1.4.2/lib/omniauth/builder.rb", line 63, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/dragonfly-1.2.0/lib/dragonfly/middleware.rb", line 14, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/exception_notification-4.1.1/lib/exception_notification/rack.rb", line 32, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/warden-1.2.7/lib/warden/manager.rb", line 36, in block in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/warden-1.2.7/lib/warden/manager.rb", line 35, in catch
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/warden-1.2.7/lib/warden/manager.rb", line 35, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_dispatch/middleware/best_standards_support.rb", line 17, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/rack-1.4.7/lib/rack/etag.rb", line 23, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/rack-1.4.7/lib/rack/conditionalget.rb", line 25, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_dispatch/middleware/head.rb", line 14, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_dispatch/middleware/params_parser.rb", line 21, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_dispatch/middleware/flash.rb", line 242, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/rack-1.4.7/lib/rack/session/abstract/id.rb", line 210, in context
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/rack-1.4.7/lib/rack/session/abstract/id.rb", line 205, in call
  File "/var/www/sites/DMPonline_v4/vendor/bundle/ruby/2.1.0/gems/actionpack-3.2.22.5/lib/action_dispatch/middleware/cookies.rb", line 341,