未定義のメソッド `グループのエラー足場コマンド

Question

を生成し実行しているときに私はRubyやRailsのに絶対に新しいですし、このコマンドを実行しているとき、私はエラーを取得しています：ここで

rails generate scaffold User name:string email:string 

は、私が取得しています完全なエラーです。

/Users/ad7863/rails_project/demo_app/config/application.rb:7: undefined method `groups' for Rails:Module (NoMethodError) 
from /Library/Ruby/Gems/1.8/gems/railties-3.0.11/lib/rails/commands.rb:15:in `require' 
from /Library/Ruby/Gems/1.8/gems/railties-3.0.11/lib/rails/commands.rb:15 
from script/rails:6:in `require' 
from script/rails:6 

私はhereで見つけることができるRuby on Railsチュートリアルに従っています。

私はRailsバージョン3.0.11を使用しています。

誰でも私が間違っていることを知っていますか？

ありがとうございました。

編集：私のapplication.rbファイルの内容：あなたのapplication.rbファイルの7行目の

require File.expand_path('../boot', __FILE__) 

require 'rails/all' 

if defined?(Bundler) 
    # If you precompile assets before deploying to production, use this line 
    Bundler.require(*Rails.groups(:assets => %w(development test))) 
    # If you want your assets lazily compiled in production, use this line 
    # Bundler.require(:default, :assets, Rails.env) 
end 

module DemoApp 
    class Application < Rails::Application 
    # Settings in config/environments/* take precedence over those specified here. 
    # Application configuration should go into files in config/initializers 
    # -- all .rb files in that directory are automatically loaded. 

# Custom directories with classes and modules you want to be autoloadable. 
# config.autoload_paths += %W(#{config.root}/extras) 

# Only load the plugins named here, in the order given (default is alphabetical). 
# :all can be used as a placeholder for all plugins not explicitly named. 
# config.plugins = [ :exception_notification, :ssl_requirement, :all ] 

# Activate observers that should always be running. 
# config.active_record.observers = :cacher, :garbage_collector, :forum_observer 

# Set Time.zone default to the specified zone and make Active Record auto-convert to this zone. 
# Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC. 
# config.time_zone = 'Central Time (US & Canada)' 

# The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded. 
# config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s] 
# config.i18n.default_locale = :de 

# Configure the default encoding used in templates for Ruby 1.9. 
config.encoding = "utf-8" 

# Configure sensitive parameters which will be filtered from the log file. 
config.filter_parameters += [:password] 

# Enable the asset pipeline 
config.assets.enabled = true 

# Version of your assets, change this if you want to expire all your assets 
config.assets.version = '1.0' 


end 
end 

Answer 1

、変更：

Bundler.require(*Rails.groups(:assets => %w(development test))) 

へ：

# Bundler.require(*Rails.groups(:assets => %w(development test)))