Symptoms
In Home > Operations > Tasks > Failed Tasks there are failed tasks Invoke Order Flow, which fail with an error:
Execution Failed: Table Order doesn't contain row with id <ID>.
Cause
Invoke Order Flow is executed for the payment orders, but they can be deleted under certain circumstances. For example, this can happen when an order with unreleased check/cash payment was cancelled. A bug with id #PBA-59968 ("Invoke Order Flow fails with 'Table Order doesn't contain row with id XXXX' on order cancellation") has been submitted about the issue. No actions are to be done with such tasks, they can be deleted.