找不到程序集 - System.Reactive.Debugger

Question

我已经安装了visual studio 2010 express,然后安装了Reactive Extensions 2.0.当我在调试模式下启动我的应用程序时,抛出异常后使用反应式扩展的部分代码:

    The assembly with display name 'System.Reactive.Debugger' failed to load in the 'Load' binding context of the AppDomain with ID 1. The cause of the failure was: 

System.IO.FileNotFoundException: Could not load file or assembly 

'System.Reactive.Debugger, Version=2.0.20823.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies

问题是我无处可找到这个dll - System.Reactive.Debugger.