Microsoft.VisualStudio.Composition.CompositionFailedException

[sijav]

Hi I recently am getting this error while opening an ionic 3.6.x (angular 4.x) project with visual studio, though everything seems to be running normally with GitHub but it worthy to look at.

• GitHub Extension for Visual Studio version: 2.3.3.38
• Visual Studio version: 15.3.5

Here is the log from %appdata%\Microsoft\VisualStudio\14.0\ActivityLog.xml

Microsoft.VisualStudio.Composition.CompositionFailedException: This part (GitHub.InlineReviews.Services.InlineCommentPeekService) cannot be instantiated.
   at Microsoft.VisualStudio.Composition.ExportProvider.PartLifecycleTracker.ThrowPartNotInstantiableException()
   at Microsoft.VisualStudio.Composition.ExportProvider.PartLifecycleTracker.GetValueReadyToExpose()
   at Microsoft.VisualStudio.Composition.RuntimeExportProviderFactory.RuntimeExportProvider.<>c__DisplayClass15_0.<GetExportedValueHelper>b__0()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.VisualStudio.Composition.RuntimeExportProviderFactory.RuntimeExportProvider.<>c__DisplayClass15_0.<GetExportedValueHelper>b__0()
   at Microsoft.VisualStudio.Composition.RuntimeExportProviderFactory.RuntimeExportProvider.GetValueForImportElement(RuntimePartLifecycleTracker importingPartTracker, RuntimeImport import, RuntimeExport export, Func`3 lazyFactory)
   at Microsoft.VisualStudio.Composition.RuntimeExportProviderFactory.RuntimeExportProvider.GetValueForImportSite(RuntimePartLifecycleTracker importingPartTracker, RuntimeImport import)
   at Microsoft.VisualStudio.Composition.RuntimeExportProviderFactory.RuntimeExportProvider.RuntimePartLifecycleTracker.<CreateValue>b__10_0(RuntimeImport import)
   at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
   at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at Microsoft.VisualStudio.Composition.RuntimeExportProviderFactory.RuntimeExportProvider.RuntimePartLifecycleTracker.CreateValue()
   at Microsoft.VisualStudio.Composition.ExportProvider.PartLifecycleTracker.Create()
   at Microsoft.VisualStudio.Composition.ExportProvider.PartLifecycleTracker.MoveNext(PartLifecycleState nextState)
   at Microsoft.VisualStudio.Composition.ExportProvider.PartLifecycleTracker.GetValueReadyToExpose()
   at Microsoft.VisualStudio.Composition.RuntimeExportProviderFactory.RuntimeExportProvider.<>c__DisplayClass15_0.<GetExportedValueHelper>b__0()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.VisualStudio.Composition.RuntimeExportProviderFactory.RuntimeExportProvider.<>c__DisplayClass15_0.<GetExportedValueHelper>b__0()
   at Microsoft.VisualStudio.Composition.DelegateServices.<>c__DisplayClass2_0`1.<As>b__0()
   at System.Lazy`1.CreateValue()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Lazy`1.get_Value()
   at Microsoft.VisualStudio.Text.Utilities.GuardedOperations.InstantiateExtension[TExtension,TMetadata,TExtensionInstance](Object errorSource, Lazy`2 provider, Func`2 getter)
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)

[jozefizso]

I get similar error every time I open Visual Studio 2015.

ActivityLog.xml: https://gist.github.com/jozefizso/59c2038ce60598f734962ec12f7678f2

[sijav]

Now I'm getting this error on various random ASP.NET projects as well

[jcansdale]

Could you try installing the following extension: https://marketplace.visualstudio.com/items?itemName=MadsKristensen.ClearMEFComponentCache

Then go to Tools > Clean MEF Component Cache... and select Yes to continue. This will reset Visual Studio's component cache and might resolve the issue.

Please let me know if this works.

[PixelEditor]

@jcansdale I tried the fix but I got the same error a couple of VS restarts later. Like @sijav I'm also experiencing it with a Solution with a couple of ASP.NET Core based projects.

[sijav]

@jcansdale I can't tell for sure if it temporary fixed, I'm getting random error again after a while I did that fix... but it take a while before I get another random error. Although I don't close visual studio and open it often, I keep them open :D

[pgmolloy]

I am getting the exception with attached log. Started happening when loading a project and since latest VS release and GitHub extension update. I remove and reattach and it is fine until closing and opening again.

Microsoft.VisualStudio.Composition.CompositionFailedException: This part (GitHub.InlineReviews.Services.InlineCommentPeekService) cannot be instantiated. at Microsoft.VisualStudio.Composition.ExportProvider.PartLifecycleTracker.ThrowPartNotInstantiableException() at Microsoft.VisualStudio.Composition.ExportProvider.PartLifecycleTracker.GetValueReadyToExpose() at Microsoft.VisualStudio.Composition.RuntimeExportProviderFactory.RuntimeExportProvider.<>c__DisplayClass15_0.b__0()

[meaghanlewis]

Hi @pgmolloy, sorry for the late reply. Don't know if you saw this, but it looks like another user was experiencing a similar problem in this issue: https://github.com/github/VisualStudio/issues/1340#issuecomment-346887360. Could you follow the steps they took and let us know if you are still getting this exception?

[grokys]

Hi @sijav are you still seeing this problem after the latest VS2017 update?