我正在使用 Ruby 1.9.3、Rails 3.2.3 和 mongrel。我做了脚手架来创建项目模型。然后我打开项目的索引页，它显示空白页。当我看到日志时，会出现一些调度程序错误，如下所示：
** Signals ready. TERM => stop. USR2 => restart. INT => stop (no restart).
** Rails signals registered. HUP => reload (without restart). It might not work well.
** Mongrel 1.2.0.pre2 available at 0.0.0.0:3000
** Use CTRL-C to stop.
2012-10-20 23:57:52 +0530: Error calling Dispatcher.dispatch #<NameError: uninitialized constant ActionController::CgiRequest>
/home/username/.rvm/gems/ruby-1.9.3-p286/gems/mongrel-1.2.0.pre2/lib/mongrel/rails.rb:76:in `block in process'
<internal:prelude>:10:in `synchronize'
/home/username/.rvm/gems/ruby-1.9.3-p286/gems/mongrel-1.2.0.pre2/lib/mongrel/rails.rb:74:in `process'
/home/username/.rvm/gems/ruby-1.9.3-p286/gems/mongrel-1.2.0.pre2/lib/mongrel.rb:165:in `block in process_client'
/home/username/.rvm/gems/ruby-1.9.3-p286/gems/mongrel-1.2.0.pre2/lib/mongrel.rb:164:in `each'
/home/username/.rvm/gems/ruby-1.9.3-p286/gems/mongrel-1.2.0.pre2/lib/mongrel.rb:164:in `process_client'
/home/username/.rvm/gems/ruby-1.9.3-p286/gems/mongrel-1.2.0.pre2/lib/mongrel.rb:291:in `block (2 levels) in run'
2012-10-20 23:58:10 +0530: Error calling Dispatcher.dispatch #<NameError: uninitialized constant ActionController::CgiRequest>
/home/username/.rvm/gems/ruby-1.9.3-p286/gems/mongrel-1.2.0.pre2/lib/mongrel/rails.rb:76:in `block in process'