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Editorial Team
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Asked: 2026-06-14T00:39:22+00:00

I have created an add-in, and every time I try to add it to

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I have created an add-in, and every time I try to add it to Tools -> Add-in manager, I get an error.

I have commented all the code from the Connect() method, to be sure that it is not giving me some hidden exceptions.

The contains the dll name – relative path, because it is easier to just copy it into the Addins folder after each build, rather than having to close Visual Studio to be able to rebuild.

I have tried to give it an absolute path, as well… Either with the absolute path, or with the dll with no extension, I get: 

Error message: Unspecified error
Error number: 80004005

I have also received a “parameter is incorrect” error, as well as “The system cannot find the file specified”.

I have gone though the tutorial, more than once. The first time, always, it works, with nothing in the dll – then I close Visual Studio, rebuild, restart, and I am back where I started.

All the issues that have this problem that I could find, suggest using an absolute path (though the documentation says it can be either absolute, relative, or url).

I have tried to set breakpoints in my code but I don’t know how to debug this…

Please help !

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1 Answer

  1. Editorial Team

    The error was caused by the fact that I had both the “ProjectAddIn – For Testing AddIn” and the release version “ProjectAddIn“, with the “ProjectAddIn.dll” next to it, in the “C:\Users\user.name\Documents\Visual Studio 2010\Addins” folder, the way I had seen it described in the directions…

    I did not understand that BOTH xml files represent the same resource, therefore contradicting themselves.

    The path in “ProjectAddIn – For Testing AddIn” should be pointed at the dll inside the project, and only after I finished with debugging, I can remove this item from the AddIns folder and replace it with the installation items, if so I desire.

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