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Asked: 2026-05-10T19:48:27+00:00

When I try to create a Excel 2007 Workbook project, in Visual Studio 2008,

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When I try to create a Excel 2007 Workbook project, in Visual Studio 2008, I get the following errormessage:

Project cannot be created because the ‘Excel Visual Studio Design-Time Adaptor Add-in’ is not working correctly. Excel might have disabled the add-in or made it inactive, or all add-ins might be disabled in your Trust Center settings. Check the add-in status in Excel Options. If the add-in is active and enabled, reinstall or repair Visual Studio Tools for Office.

I have verified that the add-in is not inactive or disabled and I have tried to repair and uninstall/reinstall VSTO several times.

What to do?

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1 Answer

  1. Just in case you haven’t checked the trust settings, this MSDN page describes how to.

    I came across this on a MSDN forum:

    For the repair to work, you’ll have to run the VS Command Prompt with Admin Priviledges (right click, run as administrator). Then run this command line:

    C:>AddinUtil -AddInRoot:’%CommonProgramFiles%\Microsoft Shared\VSTA\AppInfoDocument’ -Rebuild

    If it still doesn’t work, you may also have a corrupt pipleline store, which can be fixed like this:

    C:>AddinUtil -PipelineRoot:’%CommonProgramFiles%\Microsoft Shared\VSTA\Pipeline’ -Rebuild

    You’ll get one warning from that command but that is expected.

    Failing that, I think you will have to run a repair on the Visual Studio 2008 installation (put the installation DVD in a drive, and select the repair option).

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