‘Unable to Cast COM Object’ Error With SQL Server 2008

I have encountered an error that was driving me nuts:

Unable to cast COM object of type ‘System.__ComObject’ to interface type ‘Microsoft.VisualStudio.OLE.Interop.IServiceProvider’. This operation failed because the QueryInterface call on the COM component for the interface with IID ‘{6D5140C1-7436-11CE-8034-00AA006009FA}’ failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)). (Microsoft.VisualStudio.OLE.Interop)

Googling and Binging revealed I’m not the only one to have this issue.   I even tried the fixes here:


with no luck.   This is the second machine (same machine actually, just reinstalled Windows 7 RTM) and had the same error occur.   I got lucky this time, though, in that I noticed it started happening immediately after I installed Source Gear Vault version 3.1.5. Figuring that Vault was the most recent installed item, I tried uninstalling it and voila, the problem was gone.

I know that’s not a solution for most people – I’m lucky in that I only need Vault for a little bit as we’re moving to another source control provider.   I also suspect it’s not an issue for most folks as 3.1.5 is a really old version of Vault.   But at least I finally know what was causing the error.

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One Response to ‘Unable to Cast COM Object’ Error With SQL Server 2008

  1. Interesting,

    Keep up the good owrk,

    Thanks for writing about it

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