Issue with a single project losing it's reference to SL/WP7 libs

I have an issue where all my xaml views are saying there is a bad reference to System.Windows.dll. I ran ProcMon开发者_StackOverflow中文版 and realized it was looking for the dll's in the GAC. I started a new project, and it's looking for the dll's in the right spot (the Windows Phone 7 Referenced Assemblies folder).

All of my other projects are referencing fine (but this is the only one with views in this solution, other views work fine in other solutions). I'm pretty sure it's something to do with VS2010's assembly cache, or possibly SxS, but I can't figure it out.

Anyone have an idea? I don't want to GAC the libs, since that'll bring up other errors, I just want it restored to the way it was.

Here's the error I see in code for all my xaml pages.

Warning 1 Could not load file or assembly 'System.Windows, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' or one of its dependencies. The system cannot find the file specified. C:\Users\myUser\Desktop\MySln\MyApp\App.xaml 1 1

Thanks!

You can just expand the References folder in your project and remove the defunct reference and add the right one?!