Start events in ARIS

I keep receiving an error during a semantic check of my BPMN model against one of my end events that "this object type 'End event' violates the following rule: 'If a process uses an object type 'End' event, at least one object of type 'Start' event is required'"

My process map has a start event that is in one pool and the errors are against the end events in another pool. Do you need a start event in each pool? Pasted below