Failed to Call System.Activator.CreateInstace() 8000FFFF Catastrophic Failure RRS feed

  • Question

  • Hi Experts,

    Kindly need your help or guidance.

    I have error when run a VSTO Excel add-in as standard user. But it works fine if I run Excel as administrator. The error message, 

    "System.Runtime.InteropServices.COMException: 'Retrieving the COM class factory for component with CLSID {2C6D3CA1-2350-101B-AE3A-0040332013F0} failed due to the following error: 8000ffff Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED)).'


    The issue is, it is not allowed to run any program as Administrator on the location where I will implement this Excel add-in.

    Any suggestion or guidance will be appreciated.

    Thank you

    Sunday, January 5, 2020 7:12 AM


All replies

  • Hi,

    Thanks for posting here.

    This forum is for discuss General Windows Desktop Development Issues, but your question is close to VSTO or excel development.

    I will redirect your case to get better support.

    Thanks for your understanding.

    Best Regards,


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    Monday, January 6, 2020 8:00 AM
  • Monday, January 6, 2020 8:08 AM