When i start the server “rails s”,following error message appears:
=> Booting WEBrick
=> Rails 3.0.7 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:167:in `default_controller_and_action’: missing :controller (ArgumentError)
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:72:in `normalize_options!'
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:55:in `initialize'
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:272:in `new'
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:272:in `match'
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:1173:in `match'
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:1360:in `match'
from /home/amrit/check/config/routes.rb:8
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/route_set.rb:233:in `instance_exec'
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/route_set.rb:233:in `draw'
from /home/amrit/check/config/routes.rb:1
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:235:in `load'
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:235:in `load'
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:225:in `load_dependency'
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:596:in `new_constants_in'
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:225:in `load_dependency'
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:235:in `load'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:127:in `reload_routes!'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:127:in `each'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:127:in `reload_routes!'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:120
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/file_update_checker.rb:32:in `call'
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/file_update_checker.rb:32:in `execute_if_updated'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application/finisher.rb:51
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application/finisher.rb:52:in `call'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application/finisher.rb:52
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/initializable.rb:25:in `instance_exec'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/initializable.rb:25:in `run'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/initializable.rb:50:in `run_initializers'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/initializable.rb:49:in `each'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/initializable.rb:49:in `run_initializers'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:134:in `initialize!'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:77:in `send'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:77:in `method_missing'
from /home/amrit/check/config/environment.rb:5
from /home/amrit/check/config.ru:3:in `require'
from /home/amrit/check/[config.ru:3](http://config.ru:3)
from /usr/lib/ruby/gems/1.8/gems/rack-1.2.2/lib/rack/builder.rb:46:in `instance_eval'
from /usr/lib/ruby/gems/1.8/gems/rack-1.2.2/lib/rack/builder.rb:46:in `initialize'
from /home/amrit/check/config.ru:1:in `new'
from /home/amrit/check/[config.ru:1](http://config.ru:1)
amrit@ubuntu:~/check$ cd
amrit@ubuntu:~$ cd demo
amrit@ubuntu:~/demo$ rails s
=> Booting WEBrick
=> Rails 3.0.7 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2011-05-27 01:43:28] INFO WEBrick 1.3.1
[2011-05-27 01:43:28] INFO ruby 1.8.7 (2010-01-10) [i486-linux]
[2011-05-27 01:43:33] INFO WEBrick::HTTPServer#start: pid=2101 port=3000
Started GET “/posts” for 127.0.0.1 at Fri May 27 01:43:39 -0400 2011
Processing by PostsController#index as HTML
Post Load (74.2ms) SELECT posts.* FROM posts
Rendered posts/index.html.erb within layouts/application (25.9ms)
Completed 200 OK in 177ms (Views: 52.6ms | ActiveRecord: 74.2ms)
^Z
[1]+ Stopped rails s
amrit@ubuntu:~/demo$ clear
amrit@ubuntu:~/demo$ cd
amrit@ubuntu:~$ cd checkk
bash: cd: checkk: No such file or directory
amrit@ubuntu:~$ cd check
amrit@ubuntu:~/check$ rails s
=> Booting WEBrick
=> Rails 3.0.7 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:167:in `default_controller_and_action’: missing :controller (ArgumentError)
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:72:in `normalize_options!'
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:55:in `initialize'
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:272:in `new'
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:272:in `match'
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:1173:in `match'
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/mapper.rb:1360:in `match'
from /home/amrit/check/config/routes.rb:8
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/route_set.rb:233:in `instance_exec'
from /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/route_set.rb:233:in `draw'
from /home/amrit/check/config/routes.rb:1
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:235:in `load'
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:235:in `load'
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:225:in `load_dependency'
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:596:in `new_constants_in'
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:225:in `load_dependency'
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:235:in `load'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:127:in `reload_routes!'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:127:in `each'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:127:in `reload_routes!'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:120
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/file_update_checker.rb:32:in `call'
from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/file_update_checker.rb:32:in `execute_if_updated'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application/finisher.rb:51
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application/finisher.rb:52:in `call'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application/finisher.rb:52
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/initializable.rb:25:in `instance_exec'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/initializable.rb:25:in `run'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/initializable.rb:50:in `run_initializers'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/initializable.rb:49:in `each'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/initializable.rb:49:in `run_initializers'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:134:in `initialize!'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:77:in `send'
from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:77:in `method_missing'
from /home/amrit/check/config/environment.rb:5
from /home/amrit/check/config.ru:3:in `require'
from /home/amrit/check/[config.ru:3](http://config.ru:3)
from /usr/lib/ruby/gems/1.8/gems/rack-1.2.2/lib/rack/builder.rb:46:in `instance_eval'
from /usr/lib/ruby/gems/1.8/gems/rack-1.2.2/lib/rack/builder.rb:46:in `initialize'
from /home/amrit/check/config.ru:1:in `new'
from /home/amrit/check/[config.ru:1](http://config.ru:1)
John