This happens when you're using an older version of the Web Connector. In most cases, your application wants you to update to the latest version.

What you can do?

Follow the onscreen instructions when you get the error. If it’s not clear, capture a screenshot of the error and contact your application’s support for help.

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