QueryInterface for interface QBXMLRPLib.IRequestProcessor failed.

No compatible version of QuickBooks was found or QuickBooks is not properly installed. Only QuickBooks 2002 and above (U.S. versions) and QuickBooks 2003 and above (Canadian versions) are supported.

If you are running one of these versions, please use the "Update QuickBooks" option on the QuickBooks File Menu to update to latest Maintenance Releases.

Restart your QuickBooks file for the changes to take effect.