System.Runtime.InteropServices.COMException (0x80040154): [closed]

by

It means the class id 877AA945-1CB2-411C-ACD7-C70B1F9E2E32 is not in the registry.

You can verify this by opening regedit.exe, browsing to HKEY_CLASSES_ROOT\CLSID\{877AA945-1CB2-411C-ACD7-C70B1F9E2E32}. If your running a 32-bit app on a 64 bit OS, look for HKEY_CLASSES_ROOT\Wow6432Node\CLSID\{877AA945-1CB2-411C-ACD7-C70B1F9E2E32}

If it is there, it may be some other issue but it is probably missing. To resolve this you will usually run the installer that distributes this COM object. If you don’t have one and you know what dll implements the object, you can run regsvr32.exe (or regasm.exe for a managed dll).

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