求助：We're sorry, but something went wrong.

我是ROR新手，在使用的过程中突然遇到了We're sorry, but something went wrong.的错误。
重启机器后就不再有这个错误，但只要停掉了WEB Server,再次启动后，打开任一页面都会出现这个错误：

Status: 500 Internal Server Error Content-Type: text/html
We're sorry, but something went wrong.

We've been notified about this issue and we'll take a look at it shortly.

日志内容如下：

Session contains objects whose class definition isn't available.
Remember to require the classes for all objects kept in the session.
(Original exception: uninitialized constant Module::TTree [NameError])


C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/cgi_process.rb:161:in `stale_session_check!'

C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/cgi_process.rb:110:in `session'

C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:1052:in `assign_shortcuts_without_flash'

C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/flash.rb:140:in `assign_shortcuts'

C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:424:in `process_without_filters'

C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/filters.rb:624:in `process_without_session_management_support'

C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/session_management.rb:114:in `process'

C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:330:in `process'

C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/dispatcher.rb:41:in `dispatch'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/rails.rb:78:in `process'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/rails.rb:76:in `synchronize'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/rails.rb:76:in `process'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:618:in `process_client'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:617:in `each'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:617:in `process_client'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:736:in `run'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:736:in `initialize'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:736:in `new'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:736:in `run'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:720:in `initialize'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:720:in `new'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:720:in `run'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/configurator.rb:271:in `run'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/configurator.rb:270:in `each'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/configurator.rb:270:in `run'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/bin/mongrel_rails:127:in `run'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/command.rb:211:in `run'

C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/bin/mongrel_rails:243

C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:488:in `load'

C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:488:in `load'

C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:342:in `new_constants_in'

C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:488:in `load'

C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/servers/mongrel.rb:60

C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'

C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'

C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:in `require'

C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:342:in `new_constants_in'

C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:in `require'

C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/server.rb:39

C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'

C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'

script/server:3

希望能得到各位大侠的帮助。

没有人能帮忙吗？

我现在找到了个笨办法，那就是每次启动WEBrick之前，先把session下所有文件删掉就可以了。写了个批处理来做这事。

先将就着吧……

终于找到原因了。。。。

我在session中保存了一个TTree对象，这个对象不是通过model来定义的，而是在运行时根据数据库描述动态生成的，这样在恢复一个session时就出现了找不到TTree对象的错误。

解决方法就简单了，要么不在session中保存这个对象，要么把需要的值转换为hash或array再保存到session中就可以了。

你好！我也是个出学者。我在做程序的时候也出现了你说的问题。能不能帮忙说的更详细一些啊。

mysql 未启动也有可能报这个错