Unable to cast COM object

Unable to cast COM object

Article Contents:
When encountering the error "Unable to cast COM object of type 'System.__ComObject' to interface type 'Interop.QBXMLRP2.RequestProcessor2'", it indicates a failure in the QueryInterface call on the COM component for the interface with IID '{8DB91B17-D5A2-41DB-80A7-CC6F1E449A05}'. This error typically occurs in the context of QuickBooks software.

Resolving This Error

Step 1: Register the DLL

To address this issue, follow these steps to register the relevant DLL file:

1. **Close QuickBooks** by navigating to File > Exit.

2. Open the command prompt with administrative rights by going to Start > All Programs > Accessories. Right-click on the command prompt and select "Run as administrator".

3. Change the directory to QuickBooks' installation folder by entering: `cd C:\Program Files (x86)\Common Files\Intuit\QuickBooks`.

4. At the QuickBooks directory prompt, register the DLL by typing: `regsvr32 qbxmlrp2.dll`.

5. A confirmation message "DllRegisterServer in qbxmlrp2.dll succeeded" will appear upon successful registration.

6. Restart QuickBooks. If the error persists, consider performing a clean reinstall of QuickBooks as per Intuit's instructions.####

Step 2: Rename the QBW File

If the error continues, the issue may relate to a special character in the company file's name:

1. Close QuickBooks.

2. Navigate to the folder where the QBW company file is stored.

3. Check for any special characters in the file name.

4. Rename the company file by removing the special character.

5. Open QuickBooks and access the company file with its new name.


Should the error message reappear, contacting Intuit support is advised for further assistance, contact Intuit support.