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You should be using the latest version of the Web Connector [intuit.com]
This error is usually caused by moving your QuickBooks file to a new computer. There is a bug in QBWC that will prevent you from re-configuring the Web Connector without removing the configuration from your old computer. If you have already moved your file without removing the QBWC integration then download this tool to remove the bad OwnerID and FileID from your QB company file.
IMPORTANT: QuickBooks recommends that you backup your file before following these instructions.
Instruction for removing a duplicate OwnerID