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I recently installed MVC 4 Beta, and, when I hit F5 for any of my MVC 4 projects I get the error below. Also, if I run aspnet_regiis -i, I get the same screenshot.

Is there a way to repair just this one dll? Or, should I wipe out everything .NET- and MVC-related on my machine, then re-install .NET + MVC 4? Thanks.

enter image description here

Ian Davis
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1 Answers1

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Apply official Microsoft Update for the .NET Framework 4 (KB2468871)

Download link

KMoraz
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  • I might even try this as a fix for http://stackoverflow.com/questions/9384421/installed-mvc-4-beta-now-my-mvc-3-projects-throw-an-error-when-i-rebuild-all. we'll see! thanks. – Ian Davis Feb 27 '12 at 15:46