has a non escaped non ASCII character in non ASCII-8BIT script (RegexpError)

[kematy]

d:/Ruby25/lib/ruby/gems/2.5.0/gems/tmail-1.2.7.1/lib/tmail/utils.rb:117:in <module:TextUtils>': /.../n has a non escaped non ASCII character in non ASCII-8BIT script (RegexpError) from d:/Ruby25/lib/ruby/gems/2.5.0/gems/tmail-1.2.7.1/lib/tmail/utils.rb:110:in module:TMail'
from d:/Ruby25/lib/ruby/gems/2.5.0/gems/tmail-1.2.7.1/lib/tmail/utils.rb:53:in <top (required)>' from d:/Ruby25/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in require'
from d:/Ruby25/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in require' from d:/Ruby25/lib/ruby/gems/2.5.0/gems/tmail-1.2.7.1/lib/tmail/interface.rb:36:in <top (required)>'
from d:/Ruby25/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in require' from d:/Ruby25/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in require'
from d:/Ruby25/lib/ruby/gems/2.5.0/gems/tmail-1.2.7.1/lib/tmail/mail.rb:34:in <top (required)>' from d:/Ruby25/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in require'
from d:/Ruby25/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in require' from d:/Ruby25/lib/ruby/gems/2.5.0/gems/tmail-1.2.7.1/lib/tmail.rb:2:in <top (required)>'
from d:/Ruby25/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in require' from d:/Ruby25/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in rescue in require'
from d:/Ruby25/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:39:in require' from D:/ruby-lab/email/Tmail_receive.rb:2:in

'