This happens when Web Connector has a scheduled update and you try to exit it.

What you can do?

1. Before you exit Web Connector, uncheck all boxes under Auto-run, then Exit.

2. Select Yes on the error message.

Note: If you still get this error, reach out to Intuit Support.

Reference: https://quickbooks.intuit.com/learn-support/en-us/set-up-payments/fix-common-web-connector-errors/00/203305