ruby - New Rails project internal server error -

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i'm using ubuntu 15.04. installed rvm, ruby 2.2 , rails 4.2.2. when create new project doing rails new blog, when start server plain text message saying "internal server error". what's weird it's in plain text format.

i can't figure out why. here's error log:

started "/" 127.0.0.1 @ 2015-06-18 17:54:17 -0300  argumenterror (wrong number of arguments (2 1)):   actionpack (4.2.2) lib/action_dispatch/http/request.rb:338:in `parse_query'   rack (1.6.3) lib/rack/request.rb:191:in `get'   actionpack (4.2.2) lib/action_dispatch/http/request.rb:300:in `get'   actionpack (4.2.2) lib/action_dispatch/http/parameters.rb:14:in `parameters'   actionpack (4.2.2) lib/action_dispatch/http/filter_parameters.rb:37:in `filtered_parameters'   actionpack (4.2.2) lib/action_controller/metal/instrumentation.rb:22:in `process_action'   actionpack (4.2.2) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'   activerecord (4.2.2) lib/active_record/railties/controller_runtime.rb:18:in `process_action'   actionpack (4.2.2) lib/abstract_controller/base.rb:137:in `process'   actionview (4.2.2) lib/action_view/rendering.rb:30:in `process'   actionpack (4.2.2) lib/action_controller/metal.rb:196:in `dispatch'   actionpack (4.2.2) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'   actionpack (4.2.2) lib/action_controller/metal.rb:237:in `block in action'   actionpack (4.2.2) lib/action_dispatch/routing/route_set.rb:74:in `call'   actionpack (4.2.2) lib/action_dispatch/routing/route_set.rb:74:in `dispatch'   actionpack (4.2.2) lib/action_dispatch/routing/route_set.rb:43:in `serve'   actionpack (4.2.2) lib/action_dispatch/journey/router.rb:43:in `block in serve'   actionpack (4.2.2) lib/action_dispatch/journey/router.rb:30:in `each'   actionpack (4.2.2) lib/action_dispatch/journey/router.rb:30:in `serve'   actionpack (4.2.2) lib/action_dispatch/routing/route_set.rb:819:in `call'   rack (1.6.3) lib/rack/etag.rb:24:in `call'   rack (1.6.3) lib/rack/conditionalget.rb:25:in `call'   rack (1.6.3) lib/rack/head.rb:13:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/params_parser.rb:27:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/flash.rb:260:in `call'   rack (1.6.3) lib/rack/session/abstract/id.rb:225:in `context'   rack (1.6.3) lib/rack/session/abstract/id.rb:220:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/cookies.rb:560:in `call'   activerecord (4.2.2) lib/active_record/query_cache.rb:36:in `call'   activerecord (4.2.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:649:in `call'   activerecord (4.2.2) lib/active_record/migration.rb:378:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'   activesupport (4.2.2) lib/active_support/callbacks.rb:88:in `call'   activesupport (4.2.2) lib/active_support/callbacks.rb:88:in `_run_callbacks'   activesupport (4.2.2) lib/active_support/callbacks.rb:776:in `_run_call_callbacks'   activesupport (4.2.2) lib/active_support/callbacks.rb:81:in `run_callbacks'   actionpack (4.2.2) lib/action_dispatch/middleware/callbacks.rb:27:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/reloader.rb:73:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'   web-console (2.1.3) lib/web_console/middleware.rb:37:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'   railties (4.2.2) lib/rails/rack/logger.rb:38:in `call_app'   railties (4.2.2) lib/rails/rack/logger.rb:20:in `block in call'   activesupport (4.2.2) lib/active_support/tagged_logging.rb:68:in `block in tagged'   activesupport (4.2.2) lib/active_support/tagged_logging.rb:26:in `tagged'   activesupport (4.2.2) lib/active_support/tagged_logging.rb:68:in `tagged'   railties (4.2.2) lib/rails/rack/logger.rb:20:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/request_id.rb:21:in `call'   rack (1.6.3) lib/rack/methodoverride.rb:22:in `call'   rack (1.6.3) lib/rack/runtime.rb:18:in `call'   activesupport (4.2.2) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'   rack (1.6.3) lib/rack/lock.rb:17:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/static.rb:113:in `call'   rack (1.6.3) lib/rack/sendfile.rb:113:in `call'   railties (4.2.2) lib/rails/engine.rb:518:in `call'   railties (4.2.2) lib/rails/application.rb:164:in `call'   rack (1.6.3) lib/rack/lock.rb:17:in `call'   rack (1.6.3) lib/rack/content_length.rb:15:in `call'   rack (1.6.3) lib/rack/handler/webrick.rb:88:in `service'   /home/alepolar/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service'   /home/alepolar/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run'   /home/alepolar/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread'     rendered /home/alepolar/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.2/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (7.5ms)   started "/" 127.0.0.1 @ 2015-06-18 17:54:18 -0300  argumenterror (wrong number of arguments (2 1)):   actionpack (4.2.2) lib/action_dispatch/http/request.rb:338:in `parse_query'   rack (1.6.3) lib/rack/request.rb:191:in `get'   actionpack (4.2.2) lib/action_dispatch/http/request.rb:300:in `get'   actionpack (4.2.2) lib/action_dispatch/http/parameters.rb:14:in `parameters'   actionpack (4.2.2) lib/action_controller/metal/instrumentation.rb:22:in `process_action'   actionpack (4.2.2) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'   activerecord (4.2.2) lib/active_record/railties/controller_runtime.rb:18:in `process_action'   actionpack (4.2.2) lib/abstract_controller/base.rb:137:in `process'   actionview (4.2.2) lib/action_view/rendering.rb:30:in `process'   actionpack (4.2.2) lib/action_controller/metal.rb:196:in `dispatch'   actionpack (4.2.2) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'   actionpack (4.2.2) lib/action_controller/metal.rb:237:in `block in action'   actionpack (4.2.2) lib/action_dispatch/routing/route_set.rb:74:in `call'   actionpack (4.2.2) lib/action_dispatch/routing/route_set.rb:74:in `dispatch'   actionpack (4.2.2) lib/action_dispatch/routing/route_set.rb:43:in `serve'   actionpack (4.2.2) lib/action_dispatch/journey/router.rb:43:in `block in serve'   actionpack (4.2.2) lib/action_dispatch/journey/router.rb:30:in `each'   actionpack (4.2.2) lib/action_dispatch/journey/router.rb:30:in `serve'   actionpack (4.2.2) lib/action_dispatch/routing/route_set.rb:819:in `call'   rack (1.6.3) lib/rack/etag.rb:24:in `call'   rack (1.6.3) lib/rack/conditionalget.rb:25:in `call'   rack (1.6.3) lib/rack/head.rb:13:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/params_parser.rb:27:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/flash.rb:260:in `call'   rack (1.6.3) lib/rack/session/abstract/id.rb:225:in `context'   rack (1.6.3) lib/rack/session/abstract/id.rb:220:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/cookies.rb:560:in `call'   activerecord (4.2.2) lib/active_record/query_cache.rb:36:in `call'   activerecord (4.2.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:649:in `call'   activerecord (4.2.2) lib/active_record/migration.rb:378:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'   activesupport (4.2.2) lib/active_support/callbacks.rb:88:in `call'   activesupport (4.2.2) lib/active_support/callbacks.rb:88:in `_run_callbacks'   activesupport (4.2.2) lib/active_support/callbacks.rb:776:in `_run_call_callbacks'   activesupport (4.2.2) lib/active_support/callbacks.rb:81:in `run_callbacks'   actionpack (4.2.2) lib/action_dispatch/middleware/callbacks.rb:27:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/reloader.rb:73:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'   web-console (2.1.3) lib/web_console/middleware.rb:37:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'   railties (4.2.2) lib/rails/rack/logger.rb:38:in `call_app'   railties (4.2.2) lib/rails/rack/logger.rb:20:in `block in call'   activesupport (4.2.2) lib/active_support/tagged_logging.rb:68:in `block in tagged'   activesupport (4.2.2) lib/active_support/tagged_logging.rb:26:in `tagged'   activesupport (4.2.2) lib/active_support/tagged_logging.rb:68:in `tagged'   railties (4.2.2) lib/rails/rack/logger.rb:20:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/request_id.rb:21:in `call'   rack (1.6.3) lib/rack/methodoverride.rb:22:in `call'   rack (1.6.3) lib/rack/runtime.rb:18:in `call'   activesupport (4.2.2) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'   rack (1.6.3) lib/rack/lock.rb:17:in `call'   actionpack (4.2.2) lib/action_dispatch/middleware/static.rb:113:in `call'   rack (1.6.3) lib/rack/sendfile.rb:113:in `call'   railties (4.2.2) lib/rails/engine.rb:518:in `call'   railties (4.2.2) lib/rails/application.rb:164:in `call'   rack (1.6.3) lib/rack/lock.rb:17:in `call'   rack (1.6.3) lib/rack/content_length.rb:15:in `call'   rack (1.6.3) lib/rack/handler/webrick.rb:88:in `service'   /home/alepolar/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service'   /home/alepolar/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run'   /home/alepolar/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread'     rendered /home/alepolar/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.2/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (6.2ms)

ruby , rails seems installed properly:

alepolar@alelinux:~/workspace/blog$ ruby /home/alepolar/.rvm/rubies/ruby-2.2.2/bin/ruby alepolar@alelinux:~/workspace/blog$ rails /home/alepolar/.rvm/gems/ruby-2.2.2/bin/rails

see https://github.com/rails/rails/issues/20624.

try reverting earlier version of rack specifying version in gemfile , running bundle install.

gem 'rack', '1.6.1'

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