Lightswitch DesignTimeSafeException

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I hope someone here can help me with this exception. I get this errorbox when I try to publish my "program" created in Lightswitch. The debugger, doesn't "find" any error in the program, the program works(when started in Visual Studio).

"An unhandled exception of type 'Microsoft.Lightswitch.DesignTimeHosting.DesignTimeSafeException' occurred.

Additional information: Unable to load on or more of the requested types. Retrieve the LoaderException property for more information."

Sadly I don't find any satisfying answer. Does anyone know, how to fix this error or at least some ideas where it could come from?

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Answer: I reinstalled Visual Studio then manually searched for updates via google and reinstalled the Update Nr.4 . After that it worked.

Greetings

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