How to fix: "Unable to cast COM object of type System.__ComObject..."
This guide is provided by Conductor, the service that powers the QuickBooks
Desktop integration for many business tools, including the one that sent you
here.
If a Conductor error message directed you to this page, it’s because we encountered the following error when attempting to connect to QuickBooks Desktop on your computer:
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Unable to cast COM object of type 'System.__ComObject' to interface type'Interop.QBXMLRP2.RequestProcessor2'. This operation failed because theQueryInterface call on the COM component for the interface with IID'{8DB91B17-D5A2-41DB-80A7-CC6F1E449A05}' failed due to the following error:No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).
Complete the following steps to re-register the QuickBooks Desktop components to resolve this issue:
1
Close QuickBooks Desktop
Ensure QuickBooks Desktop is completely closed.
2
Open Command Prompt (cmd.exe) as an administrator
Using Windows search (usually located in the bottom-left corner of your screen), type “cmd”, right-click on the “Command Prompt” result, and select “Run as administrator”.
3
Run the command to re-register QuickBooks components
Copy the entire command below, then paste it into the PowerShell window and press Enter.