I began to receive the error message box in Visual Studio after a restart from an install of an unrelated to test Visual Studio plugin (which I have used in the past):
The ‘TestWindowPackage’ package did not load correctly. … examining the file … AppData\Roaming\Microsoft\VisualStudio\12.0\ActivityLog.xml
Looking at that log showed these errors:
TestWindowPackage.Initialize failed with exception … System.InvalidOperationException:
Loading MEF components failed with the following exception:
The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information.…
No exports were found that match the constraint:
ContractName Microsoft.VisualStudio.TestWindow.VsHost.PackageContainer
RequiredTypeIdentity Microsoft.VisualStudio.TestWindow.VsHost.PackageContainer
To resolve the issue I did step 1 and 2 but am showing step 3 in case it helps.
- Close all instances of Visual Studio.
- Delete all files in `
AppData__abENT__#92;Local__abENT__#92;Microsoft__abENT__#92;VisualStudio__abENT__#92;12__abENT__#46;0__abENT__#92;ComponentModelCache
` Note that directory is not found in `Roaming
` as the activity log file, but in `Local
`. - Restart, if that doesn’t work then start over with step 4.
- From a Visual Studio Command Line do this operation: `
devenv __abENT__#8260;setup __abENT__#8260;ResetSkipPkgs
` See (/Setup (devenv.exe)) for more information.