Unable to install extensions - VS 2019

[cjohnson1440]

I recently installed VS 2019 Community on my D: drive. When I try to install an extension, I get dialog saying that the installation failed and referencing a log, which contains the following:

11/1/2019 9:03:45 AM - Microsoft VSIX Installer
11/1/2019 9:03:45 AM - -------------------------------------------
11/1/2019 9:03:45 AM - vsixinstaller.exe version:
11/1/2019 9:03:45 AM - 16.4.25
11/1/2019 9:03:45 AM - -------------------------------------------
11/1/2019 9:03:45 AM - Command line parameters:
11/1/2019 9:03:45 AM - C:\program files (x86)\microsoft visual studio\installer\resources\app\ServiceHub\Services\Microsoft.VisualStudio.Setup.Service\vsixinstaller.exe,/appidinstallpath:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\IDE\devenv.exe,/skuName:Community,/skuVersion:16.3.29424.173,/appidname:Microsoft Visual Studio Community 2019,/culture:en-US,/noep,C:\Users\chjohnson.CALATLCORP\AppData\Local\Temp\VSIXhlxaxiov.vsix,C:\Users\chjohnson.CALATLCORP\AppData\Local\Temp\VSIX1jewbtaz.vsix,C:\Users\chjohnson.CALATLCORP\AppData\Local\Temp\VSIXykmortyi.vsix,C:\Users\chjohnson.CALATLCORP\AppData\Local\Temp\VSIXvs4hw2sa.vsix,C:\Users\chjohnson.CALATLCORP\AppData\Local\Temp\VSIXpo2pc0a0.vsix,C:\Users\chjohnson.CALATLCORP\AppData\Local\Temp\VSIXbcbx2q3m.vsix,C:\Users\chjohnson.CALATLCORP\AppData\Local\Temp\VSIXu0qsmhhy.vsix,C:\Users\chjohnson.CALATLCORP\AppData\Local\Temp\VSIXojgpaq3h.vsix,C:\Users\chjohnson.CALATLCORP\AppData\Local\Temp\VSIXgvcyp2ea.vsix,C:\Users\chjohnson.CALATLCORP\AppData\Local\Temp\VSIXp0kjkxbz.vsix,C:\Users\chjohnson.CALATLCORP\AppData\Local\Temp\VSIX1x5qsxbd.vsix,C:\Users\chjohnson.CALATLCORP\AppData\Local\Temp\VSIXebrh2n2t.vsix
11/1/2019 9:03:45 AM - -------------------------------------------
11/1/2019 9:03:45 AM - Microsoft VSIX Installer
11/1/2019 9:03:45 AM - -------------------------------------------
11/1/2019 9:03:47 AM - System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.VisualStudio.Setup.Cache.Instance.get_SupportsExtensions()
at VSIXInstaller.SetupExtensions.GetLaunchableInstances(IQuery query)
at VSIXInstaller.SupportedSKUs.EnumerateIsolatedInstalls(Action`1 callback)
at VSIXInstaller.SupportedSKUs.AddInstalledLocationBasedSKUs(IntPtr userToken)
at VSIXInstaller.SupportedSKUs.InitializeSupportedSKUs(IntPtr userToken)
at VSIXInstaller.ExtensionService.InitializeSupportedSKUs(ICommandLineData cmdLineData, IntPtr duplicatedUserToken)
at VSIXInstaller.App.Initialize(Boolean isRepairSupported)
at VSIXInstaller.App.Initialize()
at System.Threading.Tasks.Task`1.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)

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