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A problem with StartEvent's formProperty and BoundaryEvent

Question asked by siqiyiyi on Feb 22, 2012
Latest reply on Feb 23, 2012 by siqiyiyi
I encountered a problem like this:
I created a StartEvent with a formProperty which is not required, and a UserTask attached by a TimerBoundaryEvent.
When I didn't give the fromProperty a value then push the 'start process' button in the Activiti Explorer, wait until the TimerBoundaryEvent reaching the deadline, a error happened:

Error occurred while executing job: src-resolve: Cannot resolve the name 'extension' to a(n) 'element declaration' component.

But if I gave the fromProperty a value , the error didn't happen.
I don't know why that happens. It seemes like that the StartEvent's formProperties should be 'required' even if the attribute 'required' is 'false'.

Any help is appreciated!