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Editorial Team
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Asked: 2026-06-17T21:57:49+00:00

I have been using cmake for a project where we generate VS 2009 project.

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I have been using cmake for a project where we generate VS 2009 project. Now we are moving to 2010 and I notice that after cmake successfully generates the build directory,
I open the .sln with VS 2010, one of the projects fails to load. The output shows:

error : An item with the same key has already been added.

The GUID for that project is “29AE0C04-FA88-4802-A8FC-79D38A5E870A” and I see that there are no other projects with that GUID in the solution file.

This happens on Version 10.0.40219.1 SP1Rel with cmake 2.8.8 or 2.8.10.

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1 Answer

  1. Editorial Team

    I still don’t know the reason, but the workaround is to delete the *.filters file in the project folder. This solves the problem, but as a side effect source groups are lost.

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