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sourcetree stop launching window10

I have last used Sourcetree on last Wed, 14Jun2023. Then since 19Jun. it has stopped launching with the following error found in sourcetree.log:

ERROR [2023-06-20 11:31:47,083] [1] [Sourcetree.Composition.VSMef.Net471.VSMefCompositionManager] [Log] - Unable to load MEF components
System.InvalidOperationException: Sequence contains no elements
at System.Linq.Enumerable.First[TSource](IEnumerable`1 source)
at Microsoft.VisualStudio.Composition.PartDiscovery.GetElementTypeFromMany(Type type)
at Microsoft.VisualStudio.Composition.RuntimeComposition.RuntimeImport.get_ImportingSiteTypeWithoutCollection


2 answers

1 accepted

0 votes
Mukesh Kumar
Atlassian Team
Atlassian Team members are employees working across the company in a wide variety of roles.
Jun 19, 2023

Hi @Pon Pricha 


During windows update installation sometimes following cache files get corrupted and cause this issue: Assemblies.cache,  Composition.cache
These files are present at following location: C:\Users\<User>\AppData\Local\Atlassian\SourceTree.exe_<random_string>\<version_number>

Deleting above 2 files can resolve the issue.

Sourcetree will regenerate these files when you re-run Sourcetree.


We have resolved this issue and it will be available in upcoming Sourcetree release (3.4.14) soon.

Thanks for answer. I just rename this directory to


Then it resolved. When launching, the new one is created with the same structure and files.

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Lars Radoor Hansen
I'm New Here
I'm New Here
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Jun 29, 2023

Thanks for answer. It works :-)

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