How to Fix Error Code QBWC1039 in QuickBooks Desktop -You might see this error when you connect an app to QuickBooks Desktop using Web Connector. QuickBooks Error QBWC1039. QuickBooks every so often comes up with mistakes with its Desktop connectivity. QuickBooks Error QBWC1039 happen when users try to connect the company file to the third-party applications. Quickinfy has described solutions to fix this Call Us ☎ 1800-993-4190.