rake swagger:docs rake aborted! NoMethodError: undefined methodsource' for "GET":String /home/ram/.rvm/gems/ruby-2.3.0/gems/swagger-docs-0.1.8/lib/swagger/docs/generator.rb:147:in get_route_path_apis' /home/ram/.rvm/gems/ruby-2.3.0/gems/swagger-docs-0.1.8/lib/swagger/docs/generator.rb:128:inblock in process_path' /home/ram/.rvm/gems/ruby-2.3.0/gems/swagger-docs-0.1.8/lib/swagger/docs/generator.rb:127:in each' /home/ram/.rvm/gems/ruby-2.3.0/gems/swagger-docs-0.1.8/lib/swagger/docs/generator.rb:127:inprocess_path' /home/ram/.rvm/gems/ruby-2.3.0/gems/swagger-docs-0.1.8/lib/swagger/docs/generator.rb:62:in block in generate_doc' /home/ram/.rvm/gems/ruby-2.3.0/gems/swagger-docs-0.1.8/lib/swagger/docs/generator.rb:61:ineach' /home/ram/.rvm/gems/ruby-2.3.0/gems/swagger-docs-0.1.8/lib/swagger/docs/generator.rb:61:in generate_doc' /home/ram/.rvm/gems/ruby-2.3.0/gems/swagger-docs-0.1.8/lib/swagger/docs/generator.rb:49:inblock in generate_docs' /home/ram/.rvm/gems/ruby-2.3.0/gems/swagger-docs-0.1.8/lib/swagger/docs/generator.rb:46:in each' /home/ram/.rvm/gems/ruby-2.3.0/gems/swagger-docs-0.1.8/lib/swagger/docs/generator.rb:46:ingenerate_docs' /home/ram/.rvm/gems/ruby-2.3.0/gems/swagger-docs-0.1.8/lib/swagger/docs/generator.rb:20:in write_docs' /home/ram/.rvm/gems/ruby-2.3.0/gems/swagger-docs-0.1.8/lib/tasks/swagger.rake:5:inblock (2 levels) in <top (required)>' /home/ram/.rvm/gems/ruby-2.3.0/gems/rake-11.2.2/exe/rake:27:in <top (required)>' Tasks: TOP => swagger:docs (See full trace by running task with --trace)

I have routes something like this. Rails.application.routes.draw do