The other day, a work colleague asked for my assistance regarding a problem installing TeamReview 1.1.2 (for Visual Studio 2010 Beta 2).

The error related to “TeamReview.VSNetAddIn.Addin”, with:

System.InvalidOperationException: Method failed with unexpected error code 3.

This error message is not very helpful, so I decided to use my friends Reflector and LinqPad to help me look for the offending code and then quickly execute and replicate the exception.

To cut a long story short, I discovered that the exception occurs under Windows 7 when the following Visual Studio add-in folder does not exist:

C:\Users[Your User Name]\AppData\Roaming\Microsoft\MSEnvShared\Addins

This equates to:

%APPDATA%\Microsoft\MSEnvShared\AddIns

The problem also happens on Windows XP:

C:\Documents and Settings[Your User Name]\Application Data\Microsoft\MSEnvShared\AddIns

In order to resolve the issue, manually create the folders through Windows Explorer or run the following command:

1mkdir %APPDATA%\Microsoft\MSEnvShared\AddIns

Another work colleague has now raised this issue on the TeamReview CodePlex site.