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Open the Developer Command Prompt for VS212 as Administrator
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execute the command
cd "C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\PrivateAssemblies"
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execute the command
gacutil /if Microsoft.SqlServer.Dts.Design.dll
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restart Visual Studio
Source msdn Fail to start project
For visual Studio 2013 execute the command cd "C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\PrivateAssemblies"
in point 2 and then execute point 3 and 4.