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Rails ブログ アプリに宣言型承認を構成しようとしています。必要なすべてのことを行った後、rails s を実行してサーバーを起動しました。次のエラーで立ち往生しています。

rails s
/var/lib/gems/1.8/gems/activerecord-3.2.9/lib/active_record/dynamic_matchers.rb:50:in `method_missing': undefined local variable or method `scopes' for ActiveRecord::Base:Class (NameError)
    from /var/lib/gems/1.8/gems/declarative_authorization-0.5.2/lib/declarative_authorization/in_model.rb:37:in `included'
    from /var/lib/gems/1.8/gems/declarative_authorization-0.5.2/lib/declarative_authorization/in_model.rb:36:in `module_eval'
    from /var/lib/gems/1.8/gems/declarative_authorization-0.5.2/lib/declarative_authorization/in_model.rb:36:in `included'
    from /var/lib/gems/1.8/gems/declarative_authorization-0.5.2/lib/declarative_authorization.rb:17:in `include'
    from /var/lib/gems/1.8/gems/declarative_authorization-0.5.2/lib/declarative_authorization.rb:17:in `send'
    from /var/lib/gems/1.8/gems/declarative_authorization-0.5.2/lib/declarative_authorization.rb:17
    from /var/lib/gems/1.8/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `require'
    from /var/lib/gems/1.8/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `require'
    from /var/lib/gems/1.8/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in `each'
    from /var/lib/gems/1.8/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in `require'
    from /var/lib/gems/1.8/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `each'
    from /var/lib/gems/1.8/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `require'
    from /var/lib/gems/1.8/gems/bundler-1.2.3/lib/bundler.rb:128:in `require'
    from /blogging/config/application.rb:7
    from /var/lib/gems/1.8/gems/railties-3.2.9/lib/rails/commands.rb:53:in `require'
    from /var/lib/gems/1.8/gems/railties-3.2.9/lib/rails/commands.rb:53
    from /var/lib/gems/1.8/gems/railties-3.2.9/lib/rails/commands.rb:50:in `tap'
    from /var/lib/gems/1.8/gems/railties-3.2.9/lib/rails/commands.rb:50
    from script/rails:6:in `require'
    from script/rails:6

私のブログ アプリは、このブログアプリに多少似ています。

この問題の解決にご協力ください。ありがとう。:)-

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