rake - getting the error warning: already initialized constant Mime::DOCX during bundle install in rails -


when try run rake db:migrate in rails application, tables not getting migrated, instead getting deprecated warning messages below. no idea on how fix this.

mahesh@mahesh-optiplex-390:~/proj/support_app$ rake db:migrate warning: parser/current loading parser/ruby22, recognizes warning: 2.2-compliant syntax, running 2.3.1. [deprecation] `last_comment` deprecated.  please use `last_description` instead. [deprecation] `last_comment` deprecated.  please use `last_description` instead. [deprecation] `last_comment` deprecated.  please use `last_description` instead. /home/prashanth/.rvm/gems/ruby-2.3.1/gems/actionpack-4.2.6/lib/action_dispatch/http/mime_type.rb:163: warning: initialized constant mime::docx /home/prashanth/.rvm/gems/ruby-2.3.1/gems/actionpack-4.2.6/lib/action_dispatch/http/mime_type.rb:163: warning: previous definition of docx here mahesh@mahesh-optiplex-390:~/proj/support_app$


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