Error message example:

A Quickbooks action has been recently requested. Unfortunately, this resulted in an error.

More information is below.

error: 3391 - The iteratorID "{xxxxxxxxxx}" is not valid.

name: ReceivePaymentQueryRq

This error can happen when the Web Connector is shut down in the middle of a communication cycle. Then when it starts up again, it has lost track of what it was doing before.
 
You can ignore this error.