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Home/ Questions/Q 8910851
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Editorial Team
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Editorial Team
Asked: June 15, 20262026-06-15T03:47:46+00:00 2026-06-15T03:47:46+00:00

I am trying to modify a VS add-in, this addin has multiple projects. The

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I am trying to modify a VS add-in, this addin has multiple projects. The addin project itself, some class librarys that it uses an an user interface project.

When I try to debug I get the error “A project with the output type of class library cannot be started directly.” Since all projects essentially have the same output type, I am not sure what to do. I tried making sure the startup project is the actual vs addin project, and I still get the same errors. I have never worked with an add-in before so I figure I am probably missing an important step here. I am using vs 2010, and the addin targets that aswell.

Any help would be appreciated.

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  1. Editorial Team
    Editorial Team
    2026-06-15T03:47:48+00:00Added an answer on June 15, 2026 at 3:47 am

    Did you try to specify Start external program property of Debug section of the project properties? Try to set a full path to Visual Studio exe (something like “C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe”)

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