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SourceTree won't start - Unable to load MEF components

Sven Schuchmann

Hi,

I am using SourceTree Enterprise 3.4.13.0 on Windows 10.
After a Windows Update Today it does not start anymore.
Only see splash screen then it closes.
Tried uninstalling Reinstalling, nothing helped.

In the SourceTree.log I see this error:

ERROR [2023-06-14 09:23:59,047] [1] [Sourcetree.Composition.VSMef.Net48.VSMefCompositionManager] [Log] - Unable to load MEF components
System.InvalidOperationException: Die Sequenz enthält keine Elemente.
bei System.Linq.Enumerable.First[TSource](IEnumerable`1 source)
bei Microsoft.VisualStudio.Composition.PartDiscovery.GetElementTypeFromMany(Type type)
bei Microsoft.VisualStudio.Composition.RuntimeComposition.RuntimeImport.get_ImportingSiteTypeWithoutCollection()
bei Microsoft.VisualStudio.Composition.RuntimeComposition.RuntimeImport.get_IsLazy()
bei Microsoft.VisualStudio.Composition.RuntimeComposition.RuntimeImport.get_LazyFactory()
bei Microsoft.VisualStudio.Composition.RuntimeExportProviderFactory.RuntimeExportProvider.GetValueForImportSite(RuntimePartLifecycleTracker importingPartTracker, RuntimeImport import)
bei Microsoft.VisualStudio.Composition.RuntimeExportProviderFactory.RuntimeExportProvider.RuntimePartLifecycleTracker.SatisfyImports()
...

Can anyone help?

Accepted answers

Sven Schuchmann

Deleting

%LOCALAPPDATA%\Atlassian\SourceTree.exe_<UID>\3.4.13.0\Assemblies.cache
%LOCALAPPDATA%\Atlassian\SourceTree.exe_<UID>\3.4.13.0\Composition.cache

helped!

All comments

Sven Schuchmann

Deleting

%LOCALAPPDATA%\Atlassian\SourceTree.exe_<UID>\3.4.13.0\Assemblies.cache
%LOCALAPPDATA%\Atlassian\SourceTree.exe_<UID>\3.4.13.0\Composition.cache

helped!

Richard Jackson_2pqiyd

I have the same issue

Sven Schuchmann

Can you check my answer below helps?

Richard Jackson_2pqiyd

This worked for me too

Richard Jackson_2pqiyd

yes, its fixed

Caleb Widmer

came here same reason,
thanks for the work arounds.
Uninstall/reinstall seems to work at least from SourceTree-3.4.8 to 3.4.13

Tomas Franco_ko4xx0

Thank you so much glad someone was able to solve this.

Kevin Henderson_n17cdb

Same issue for me and this worked. Thanks!

Harry Playfair

Exact same issue here, deleting the single file solved it:

Composition.cache

However, the problem has recurred twice - will we see a fix soon?

Sean Lively

My entire team got bit by this bug after recent windows updates.

Ivan Lopez_bsds23

It works for me too. Thanks a lot!!

Radek Havelka

had the same issue, deleting the files helped, thanks !

StuartWhiting

same thing happened here. glad to find this post quickly.

Eric Bongaerts

Works for me as well. Thnx!

Mukesh Kumar_r9umvu

We have fixed this issue in Sourcetree 3.4.14 and is available for upgrade.

zsw_49e3dw

Thank for you help♥

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