Ruby on rails 3 `方法u缺失'；：未定义的方法`user_class='；对于#<；工头：发动机：0x9de6bc0>；

当我运行rails服务器时，我遇到了这个错误。 “bundle安装”已经成功。我的RVM使用ruby 1.9.3和rails 3.2，但项目需要rails 3.1。我认为bundle已经解决了问题，因为bundle。rails和ruby可能不是原因。 什么都行，谢谢 您的包已完成！ 它已安装到./vendor/bundle中

magic@magic-ThinkPad-T430u:~/Documents/rails/ticketee-book$ rails server
=> Booting WEBrick
=> Rails 3.1.0.rc2 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/railtie/configurable.rb:30:in `method_missing': undefined method `user_class=' for #<Forem::Engine:0x9de6bc0> (NoMethodError)
    from /home/magic/Documents/rails/ticketee-book/config/initializers/forem.rb:1:in `<top (required)>'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:235:in `load'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:235:in `block in load'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:641:in `new_constants_in'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:235:in `load'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/engine.rb:544:in `block (2 levels) in <class:Engine>'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/engine.rb:543:in `each'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/engine.rb:543:in `block in <class:Engine>'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/initializable.rb:25:in `instance_exec'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/initializable.rb:25:in `run'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/initializable.rb:50:in `block in run_initializers'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/initializable.rb:49:in `each'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/initializable.rb:49:in `run_initializers'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/application.rb:96:in `initialize!'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/railtie/configurable.rb:30:in `method_missing'
    from /home/magic/Documents/rails/ticketee-book/config/environment.rb:5:in `<top (required)>'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:239:in `require'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:239:in `block in require'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:641:in `new_constants_in'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:239:in `require'
    from /home/magic/Documents/rails/ticketee-book/config.ru:4:in `block in <main>'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib/rack/builder.rb:51:in `instance_eval'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib/rack/builder.rb:51:in `initialize'
    from /home/magic/Documents/rails/ticketee-book/config.ru:1:in `new'
    from /home/magic/Documents/rails/ticketee-book/config.ru:1:in `<main>'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib/rack/builder.rb:40:in `eval'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib/rack/builder.rb:40:in `parse_file'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib/rack/server.rb:200:in `app'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/commands/server.rb:46:in `app'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib/rack/server.rb:301:in `wrapped_app'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib/rack/server.rb:252:in `start'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/commands/server.rb:70:in `start'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/commands.rb:54:in `block in <top (required)>'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/commands.rb:49:in `tap'
    from /home/magic/Documents/rails/ticketee-book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/commands.rb:49:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

magic@magic-ThinkPad-T430u:~/Documents/rails/tickete book$rails服务器
=>启动WEBrick
=>Rails 3.1.0.rc2应用程序在上开始开发http://0.0.0.0:3000
=>使用-d调用以分离
=>Ctrl-C关闭服务器
退出
/home/magic/Documents/rails/ticketebook/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/railtie/configurable.rb:30:in'method#missing'：未定义的方法'user_class='（nomethodorderror）
from/home/magic/Documents/rails/tickete book/config/initializers/forem.rb:1:in`'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:235:在“加载”中
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:235:“加载中的块”
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_-support/dependenciples.rb:225:“加载中的块依赖项”
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active\u support/dependencies.rb:641:in'new\u constants\u in'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active\u support/dependencies.rb:225:在“加载依赖项”中
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:235:在“加载”中
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/engine.rb:544:in“块（2层）”中
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/engine.rb:543:in'each'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/engine.rb:543:in'block in'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/initializable.rb:25:in'instance_exec'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/initializable.rb:25:in'run'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/initializable.rb:50:“运行中的块初始化器”
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/initializable.rb:49:in'each'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/initializable.rb:49:in“run_initializers”
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/application.rb:96:in'initialize！'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/railtie/configurable.rb:30:in'method_missing'
from/home/magic/Documents/rails/tickete book/config/environment.rb:5:in`'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:239:in'require'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependenciences.rb:239:in'block in require'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_-support/dependenciples.rb:225:“加载中的块依赖项”
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active\u support/dependencies.rb:641:in'new\u constants\u in'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active\u support/dependencies.rb:225:在“加载依赖项”中
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/activesupport/lib/active_support/dependencies.rb:239:in'require'
from/home/magic/Documents/rails/tickete book/config.ru:4:in'block in'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib/rack/builder.rb:51:in'instance_eval'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib/rack/builder.rb:51:in'initialize'
from/home/magic/Documents/rails/tickete book/config.ru:1:in'new'
from/home/magic/Documents/rails/tickete book/config.ru:1:in`'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib/rack/builder.rb:40:in'eval'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib/rack/builder.rb:40:in'parse_file'
from/home/magic/Documents/rails/ticketebook/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib/rack/server.rb:200:in'app'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/bundler/gems/rails-623c16f4f8b7/railties/lib/rails/commands/server.rb:46:in'app'
from/home/magic/Documents/rails/tickete book/vendor/bundle/ruby/1.9.1/gems/rack-1.3.0/lib
bundle exec rails server