I have experiencing some problems with the usage of scaffold.
I have defined a controller as followings:

class ListItemsController < ApplicationController
scaffold :list_item
end

After that I try to access the webpage but it gives the following errors:
Does anybody experience the same error before? Any idea to get across it?

NoMethodError in List itemsController#index

undefined method `scaffold' for ListItemsController:Class

RAILS_ROOT: /home/user/projects/ShoppingList
Application Trace | Framework Trace | Full Trace

app/controllers/list_items_controller.rb:2

vendor/rails/activesupport/lib/active_support/dependencies.rb:203:in `load_without_new_constant_marking'
vendor/rails/activesupport/lib/active_support/dependencies.rb:203:in `load_file'
vendor/rails/activesupport/lib/active_support/dependencies.rb:342:in `new_constants_in'
vendor/rails/activesupport/lib/active_support/dependencies.rb:202:in `load_file'
vendor/rails/activesupport/lib/active_support/dependencies.rb:94:in `require_or_load'
vendor/rails/activesupport/lib/active_support/dependencies.rb:248:in `load_missing_constant'
vendor/rails/activesupport/lib/active_support/dependencies.rb:453:in `const_missing'
vendor/rails/activesupport/lib/active_support/dependencies.rb:465:in `const_missing'
vendor/rails/activesupport/lib/active_support/inflector.rb:257:in `constantize'
vendor/rails/activesupport/lib/active_support/core_ext/string/inflections.rb:148:in `constantize'
vendor/rails/actionpack/lib/action_controller/routing.rb:1426:in `recognize'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:170:in `handle_request'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:115:in `dispatch'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:126:in `dispatch_cgi'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:9:in `dispatch'
vendor/rails/railties/lib/webrick_server.rb:112:in `handle_dispatch'
vendor/rails/railties/lib/webrick_server.rb:78:in `service'
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:23:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:82:in `start'
vendor/rails/railties/lib/webrick_server.rb:62:in `dispatch'
vendor/rails/railties/lib/commands/servers/webrick.rb:66
/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `require'
vendor/rails/activesupport/lib/active_support/dependencies.rb:496:in `require'
vendor/rails/activesupport/lib/active_support/dependencies.rb:342:in `new_constants_in'
vendor/rails/activesupport/lib/active_support/dependencies.rb:496:in `require'
vendor/rails/railties/lib/commands/server.rb:39
script/server:3:in `require'
script/server:3

app/controllers/list_items_controller.rb:2
vendor/rails/activesupport/lib/active_support/dependencies.rb:203:in `load_without_new_constant_marking'
vendor/rails/activesupport/lib/active_support/dependencies.rb:203:in `load_file'
vendor/rails/activesupport/lib/active_support/dependencies.rb:342:in `new_constants_in'
vendor/rails/activesupport/lib/active_support/dependencies.rb:202:in `load_file'
vendor/rails/activesupport/lib/active_support/dependencies.rb:94:in `require_or_load'
vendor/rails/activesupport/lib/active_support/dependencies.rb:248:in `load_missing_constant'
vendor/rails/activesupport/lib/active_support/dependencies.rb:453:in `const_missing'
vendor/rails/activesupport/lib/active_support/dependencies.rb:465:in `const_missing'
vendor/rails/activesupport/lib/active_support/inflector.rb:257:in `constantize'
vendor/rails/activesupport/lib/active_support/core_ext/string/inflections.rb:148:in `constantize'
vendor/rails/actionpack/lib/action_controller/routing.rb:1426:in `recognize'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:170:in `handle_request'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:115:in `dispatch'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:126:in `dispatch_cgi'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:9:in `dispatch'
vendor/rails/railties/lib/webrick_server.rb:112:in `handle_dispatch'
vendor/rails/railties/lib/webrick_server.rb:78:in `service'
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:23:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:82:in `start'
vendor/rails/railties/lib/webrick_server.rb:62:in `dispatch'
vendor/rails/railties/lib/commands/servers/webrick.rb:66
/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `require'
vendor/rails/activesupport/lib/active_support/dependencies.rb:496:in `require'
vendor/rails/activesupport/lib/active_support/dependencies.rb:342:in `new_constants_in'
vendor/rails/activesupport/lib/active_support/dependencies.rb:496:in `require'
vendor/rails/railties/lib/commands/server.rb:39
script/server:3:in `require'
script/server:3

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---
flash: !map:ActionController::Flash::FlashHash {}