How to start a call activity?

this is process
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only set called elment:
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when it com to the task of “销售上载新版数据”,it throw a Exception when complete task:

Unknown property used in expression: #{prm.getSingleTaskAssignee(bpmProcInstanceId, “role”)}

the call activity can’t start
and where can i invoke startProcess() to set start data

Answered here: How to use Submodels in BPM?

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