IsVisualStudio2012ProInstalled() method not found error when running an SSIS package from VS2012

Question

I\'m trying to run an SSIS package in Visual Studio 2012. When I click the \"Start\" button I get this very odd error in a popup from Visual Studio:

Method          


        

Answer 1

This is probably happening because you have Visual Studio 2013 and the BI tools for it installed also. If you use Visual Studio 2013 for the same package it will probably work. The other answer suggesting the run of gacutil to register the old version may have negative impacts later when you want to use the Visual Studio 2013 tools for SSIS.