Visual Studio: How to Resolve TestWindowPackage.Initialize Failure
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.
Thanks.
Step 1 &2 solved my issue
thanks, steps 1 & 2 fixed my issue as well.
After deleting the cache, I got a different error on loading. But closed and opened Visual Studio again and it is all better.
Many thanks, step 1 fixed the issue for me!
Some blogs suggested purging the Visual Studio installation completely. Good thing I continued searching for an answer and found your blog. :-)
For the record, my error messages in ActivityLog were different than yours; however, the actual result was similar, test explorer could not open and show any tests.
Steps 1 and 2 did it!!!! Thank you so much!!!!!!!!!!
Step1 and 2 helped !
Brilliant! I thought I was done for. Clearing the folder worked for me.
Thank you, I ran into this same issues with Visual Studio 2015 after installing update 2. Steps 1 and 2 fixed it for me.
Thanks, after a small path adjustment it worked for Visual Studio 2015:
%localappdata%\Microsoft\VisualStudio\14.0
Soluciono el problema con el primero
(First step solved it for me).