20.4.3 Library not registered. (Exception from HRESULT: 0x8002801D (TYPE_E_LIBNOTREGISTERED))

[loginerror (Maciej Kuźmicz)]

Hi @are

Maybe these topics will help you a bit:

Error in Excel 2010 when using Excel activities

[ExcelError] Getting the below error after downgrade to 2010 from 2013, in Excel Application scope An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is: System.Exception: Error opening workbook. Make sure Excel is installed. ----> System.InvalidCastException: Unable to cast COM object of type ‘Microsoft.Office.Interop.Excel.ApplicationClass’ to interface type ‘Microsoft.Office.Interop.Excel._Application’. This operation failed because the QueryInterface ca…

Word Activity Fails

Now the error has changed. RemoteException wrapping System.InvalidCastException: Unable to cast COM object of type ‘Microsoft.Office.Interop.Word.ApplicationClass’ to interface type ‘Microsoft.Office.Interop.Word._Application’. This operation failed because the QueryInterface call on the COM component for the interface with IID ’ { 00020970-0000-0000-C000-000000000046 }’ failed due to the following error: Library not registered. (Exception from HRESULT: 0x8002801D (TYPE_E_LIBNOTREGISTERED)). …

Both contain a post marked as a solution to this error message.