Issue With SystemUI.dll - System.Runtime.InteropServices.COMException

CalebDruckemiller — Wed, 25 May 2022 14:48:12 GMT

I'm trying to run an existing .NET app and getting to a part where it's instantiating an "MxDocumentClass" which I believe resides in the ArcGIS.ArcMapUI dll, it loads in that ArcMapUI.dll file, then several others afterwards:

Loaded '...\ESRI.ArcGIS.Framework.dll'.
Loaded '...\ESRI.ArcGIS.CatalogUI.dll'.
Loaded '...\ESRI.ArcGIS.Output.dll'.
Loaded '...\stdole.dll'.
Loaded '...\Microsoft.VisualStudio.Interop.dll'.
Loaded '...\ESRI.ArcGIS.ADF.Local.dll'.

but then hits:
Loaded ...\ESRI.ArcGIS.SystemUI.dll'.

And I receive: Exception thrown: 'System.Runtime.InteropServices.COMException' in APP.exe
Retrieving the COM class factory for component with CLSID {006B1AFE-C66C-11D0-B94C-080009EE4E51} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).

I've tried manually registering the DLL is several ways:

Double clicking and registering via the ESRI Arc Registration Tool. This gives me a successful message but is still not registered.
Using regsvr32 through an elevated (administrator) Command Prompt AND Powershell
Running sfc /scannow in an elevated command prompt.

None of which have worked. I am running in x86 Build configuration, so I know that's not the issue either. Does anyone have any ideas?

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Issue With SystemUI.dll - System.Runtime.InteropServices.COMException