Issue occurs regularly, perhaps once or twice day, an exception is displayed in Team Explorer when launching Visual Studio.
Current workaround is to uninstall and re-install GitHub Extension (but currently having to do this often) Extension then works without problem for a few hours.

Microsoft.VisualStudio.Composition.CompositionFailedException: An exception was thrown while initializing part "GitHub.VisualStudio.TeamExplorer.Connect.GitHubConnectSection0". ---> System.Windows.Markup.XamlParseException: Set property 'GitHub.VisualStudio.Helpers.SharedDictionaryManager.Source' threw an exception. ---> System.IO.FileNotFoundException: Could not load file or assembly 'GitHub.UI, Culture=neutral' or one of its dependencies. The system cannot find the file specified.
   at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
   at System.Reflection.Assembly.Load(AssemblyName assemblyRef)
   at System.Windows.Navigation.BaseUriHelper.GetLoadedAssembly(String assemblyName, String assemblyVersion, String assemblyKey)
   at MS.Internal.AppModel.ResourceContainer.GetResourceManagerWrapper(Uri uri, String& partName, Boolean& isContentFile)
   at MS.Internal.AppModel.ResourceContainer.GetPartCore(Uri uri)
   at System.IO.Packaging.Package.GetPartHelper(Uri partUri)
   at System.IO.Packaging.Package.GetPart(Uri partUri)
   at System.IO.Packaging.PackWebResponse.CachedResponse.GetResponseStream()
   at System.IO.Packaging.PackWebResponse.GetResponseStream()
   at System.IO.Packaging.PackWebResponse.get_ContentType()
   at MS.Internal.WpfWebRequestHelper.GetContentType(WebResponse response)
   at MS.Internal.WpfWebRequestHelper.GetResponseStream(WebRequest request, ContentType& contentType)
   at System.Windows.ResourceDictionary.set_Source(Uri value)
   at GitHub.VisualStudio.Helpers.SharedDictionaryManager.set_Source(Uri value) in Y:\jenkins\workspace\GitHub for Visual Studio speakeasy jenkinskeep\src\common\SharedDictionaryManager.cs:line 54
   --- End of inner exception stack trace ---
   at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
   at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
   at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
   at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
   at GitHub.VisualStudio.UI.Views.GitHubConnectContent.InitializeComponent() in Y:\jenkins\workspace\GitHub for Visual Studio speakeasy jenkinskeep\src\GitHub.VisualStudio.UI\UI\Views\GitHubConnectContent.xaml:line 1
   at GitHub.VisualStudio.UI.Views.GitHubConnectContent..ctor() in Y:\jenkins\workspace\GitHub for Visual Studio speakeasy jenkinskeep\src\GitHub.VisualStudio.UI\UI\Views\GitHubConnectContent.xaml.cs:line 16
   at GitHub.VisualStudio.TeamExplorer.Connect.GitHubConnectSection.OnPropertyChange(Object sender, PropertyChangedEventArgs e) in Y:\jenkins\workspace\GitHub for Visual Studio speakeasy jenkinskeep\src\GitHub.TeamFoundation.14\Connect\GitHubConnectSection.cs:line 198
   at GitHub.Primitives.NotificationAwareObject.RaisePropertyChanged(String propertyName) in Y:\jenkins\workspace\GitHub for Visual Studio speakeasy jenkinskeep\src\GitHub.Exports\Helpers\NotificationAwareObject.cs:line 12
   at GitHub.VisualStudio.Base.TeamExplorerItemBase.set_IsVisible(Boolean value) in Y:\jenkins\workspace\GitHub for Visual Studio speakeasy jenkinskeep\src\GitHub.VisualStudio.UI\Base\TeamExplorerItemBase.cs:line 141
   at GitHub.VisualStudio.TeamExplorer.Connect.GitHubConnectSection.Refresh(IConnection connection) in Y:\jenkins\workspace\GitHub for Visual Studio speakeasy jenkinskeep\src\GitHub.TeamFoundation.14\Connect\GitHubConnectSection.cs:line 160
   at GitHub.VisualStudio.TeamExplorer.Connect.GitHubConnectSection.UpdateConnection() in Y:\jenkins\workspace\GitHub for Visual Studio speakeasy jenkinskeep\src\GitHub.TeamFoundation.14\Connect\GitHubConnectSection.cs:line 190
   at GitHub.VisualStudio.TeamExplorer.Connect.GitHubConnectSection..ctor(ISimpleApiClientFactory apiFactory, ITeamExplorerServiceHolder holder, IConnectionManager manager, IPackageSettings packageSettings, Int32 index) in Y:\jenkins\workspace\GitHub for Visual Studio speakeasy jenkinskeep\src\GitHub.TeamFoundation.14\Connect\GitHubConnectSection.cs:line 108
   at GitHub.VisualStudio.TeamExplorer.Connect.GitHubConnectSection0..ctor(ISimpleApiClientFactory apiFactory, ITeamExplorerServiceHolder holder, IConnectionManager manager, IPackageSettings settings) in Y:\jenkins\workspace\GitHub for Visual Studio speakeasy jenkinskeep\src\GitHub.TeamFoundation.14\Connect\GitHubConnectSection0.cs:line 21
   --- End of inner exception stack trace ---
   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.MoveToState(PartLifecycleState requiredState)
   at Microsoft.VisualStudio.Composition.ExportProvider.PartLifecycleTracker.GetValueReadyToExpose()
   at Microsoft.VisualStudio.Composition.ExportProvider.<>c__DisplayClass53_0.<CreateExport>b__0()
   at Microsoft.VisualStudio.Composition.ExportProvider.<>c__DisplayClass55_0.<CreateExportFactoryExport>b__1()
   at Microsoft.VisualStudio.Composition.ExportProvider.<>c__DisplayClass54_0.<CreateExportFactory>b__0()
   at Microsoft.VisualStudio.Composition.DelegateServices.<>c__DisplayClass2_0`1.<As>b__0()
   at System.ComponentModel.Composition.ExportFactory`1.CreateExport()
   at Microsoft.VisualStudio.Composition.NetFxAdapters.MefV1ExportProvider.ComposablePartDefinitionForExportFactory.CreatePart()
   at System.ComponentModel.Composition.ReflectionModel.ExportFactoryCreator.LifetimeContext.GetExportLifetimeContextFromExport[T](Export export)
   at System.ComponentModel.Composition.ReflectionModel.ExportFactoryCreator.<>c__DisplayClass6_0`2.<CreateStronglyTypedExportFactoryOfTM>b__0()
   at System.ComponentModel.Composition.ExportFactory`1.CreateExport()
   at Microsoft.TeamFoundation.Controls.WPF.TeamExplorer.Framework.TeamExplorerSectionHost.Create()

Visual Studio 14.0.254.25.01 Update 3

Git Hub Extension
1.0.18.6

Logs from:
%appdata%\Microsoft\VisualStudio\14.0\ActivityLog.xml
%localappdata%\temp\extension.log
%localappdata%\GitHubVisualStudio\extension.log

logs.zip

Seems related to #142

@cookston This looks to be the same as #461. So sorry you're getting this, it's a race condition introduced in 1.0.18.3 that wasn't getting triggered until very recently, for some reason 😢

We have a fix for it in version 2.0.14, which is due out today and is already available in our custom gallery feed (https://visualstudio.github.com/releases/feed.rss), from our releases page, or directly from https://ghfvs-installer.github.com/releases/stable/2.0.14.0/GitHub.VisualStudio.vsix

Could you try it out and see if it fixes things for you? It fixes this on our testing, but the more confirmation the better.

2.0.14.1 is live in the Visual Studio gallery with a fix for this.

Great - thank you! So far it is working well.

I spoke too soon.
The problem remains with 2.0.14.1:

😢

There's a few more things I can think of doing to track this down, I'll get a patch going and link you to a new build in a bit.

Does the Connect page start failing randomly after working for a while? Or does it only fail when you first go to it after starting VS?

I suspect this got introduced in 1.0.18.3. If that's the case, then you can try downgrading to https://github.com/github/VisualStudio/releases/tag/v1.0.18.2 while we investigate.

OK thanks - I have reverted. Will let you know if the problem occurs with v1.10.18.2

@cookston There is a new build, 2.0.14.2, which includes a potential fix to the issue you're seeing 🙏

You can download it from http://ghfvs-installer.github.com/releases/2.0.14.2/GitHub.VisualStudio.vsix or from the releases page.

Please do let us know if this fixes things, we can't currently repro the issue so it's hard for us to be 100% confident that we've covered all the edge cases here.

Should be fixed in 2.0.14.2 and above.

Yes - thanks the issue has not returned since the upgrade.