CWTKV0409E The ''`2`'' atLeastExpectedState in the ''`1`'' escalation is not valid for invocation tasks in the ''`0`'' task model.

Explanation
The invocation task must have all atLeastExpectedStates set to "ended".
User response
Change the atLeastExpectedState to "ended". In IBM Integration Designer, in the human task editor, select the escalation on the canvas. In the Properties view, on the Details tab, select "Ended" in the Expected task state field.