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:
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\Local\Microsoft\VisualStudio\12.0\ComponentModelCacheNote that directory is not found in
Roamingas the activity log file, but in
- Restart, if that doesn’t work then start over with step 4.
- From a Visual Studio Command Line do this operation:
devenv /setup /ResetSkipPkgsSee (/Setup (devenv.exe)) for more information.