MVC :: Trying To Use Add View Dialog, It Popup Error CS0234?

Apr 29, 2010

The day before everything just works fine.

I leaved my VS2008 opened with my project whole night, this morning my machine was automatically rebooted by Windows 7 Update.

So I opened VS to continue my work, when I was trying to use Add View dialog, it popup this error:

error CS0234: Compiling transformation: The type or namespace name 'Data' does not exist in the namespace 'System' (are you missing an assembly reference?)

Also, I try to create another new MVC2 web project, Add view dialog just works fine. How come??

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