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Could not start QuickBooks (Accounting Connector)

Accounting Connector is unable to connect to Quickbooks. Typically this happens when multiple company files are being used, multiple users have a lock, or when a connection or service was not closed completely.

Error: Microsoft.NET Framework – Unhandled exception has occurred in your application … Could not start QuickBooks

Solution: Close both the Accounting Connector and Quickbooks completely. You may need to reboot your computer to get Quickbooks to close completely since it tends to keep connections open in the background.