ruby - Rails - Everytime I create a new project I get: Error during failsafe response: wrong number of arguments (2 for 1) -

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whenever create new projects in rails using rails new project_name , start server @ localhost:3000, keep getting following error:

  rendered /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (8.4ms) error during failsafe response: wrong number of arguments (2 1)   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/actionpack-4.2.1/lib/action_dispatch/http/request.rb:338:in `parse_query'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rack-1.6.3/lib/rack/request.rb:191:in `get'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/actionpack-4.2.1/lib/action_dispatch/http/request.rb:300:in `get'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/actionpack-4.2.1/lib/action_dispatch/http/parameters.rb:14:in `parameters'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/actionpack-4.2.1/lib/action_dispatch/http/mime_negotiation.rb:59:in `formats'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/actionpack-4.2.1/lib/action_dispatch/middleware/public_exceptions.rb:22:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/actionpack-4.2.1/lib/action_dispatch/middleware/show_exceptions.rb:47:in `render_exception'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/actionpack-4.2.1/lib/action_dispatch/middleware/show_exceptions.rb:35:in `rescue in call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/actionpack-4.2.1/lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/railties-4.2.1/lib/rails/rack/logger.rb:38:in `call_app'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/railties-4.2.1/lib/rails/rack/logger.rb:20:in `block in call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activesupport-4.2.1/lib/active_support/tagged_logging.rb:68:in `block in tagged'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activesupport-4.2.1/lib/active_support/tagged_logging.rb:26:in `tagged'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activesupport-4.2.1/lib/active_support/tagged_logging.rb:68:in `tagged'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/railties-4.2.1/lib/rails/rack/logger.rb:20:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/actionpack-4.2.1/lib/action_dispatch/middleware/request_id.rb:21:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rack-1.6.3/lib/rack/methodoverride.rb:22:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rack-1.6.3/lib/rack/runtime.rb:18:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/activesupport-4.2.1/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rack-1.6.3/lib/rack/lock.rb:17:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/actionpack-4.2.1/lib/action_dispatch/middleware/static.rb:113:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rack-1.6.3/lib/rack/sendfile.rb:113:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/railties-4.2.1/lib/rails/engine.rb:518:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/railties-4.2.1/lib/rails/application.rb:164:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rack-1.6.3/lib/rack/lock.rb:17:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rack-1.6.3/lib/rack/content_length.rb:15:in `call'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rack-1.6.3/lib/rack/handler/webrick.rb:88:in `service'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `service'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run'   /users/banait/.rbenv/versions/2.1.2/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread' ^c[2015-06-18 17:01:18] info  going shutdown ... [2015-06-18 17:01:18] info  webrick::httpserver#start done.

all existing projects start fine. new ones effected. didn't install gem or application prior error. happened out of no where. if can appreciated, thanks!

i found solution , decided share you. try see if works. go gemfile.lock , find rack (1.6.3) change rack (1.6.2). bundler updated that. , try again.


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