BPM task failed at end event

I had the scenario, where the task (or activity) with Client-side human service (CSHS) in BPM 8.5.7 was failing. The CSHS was completing successfully on standalone run, but it was failing when used in the process, not letting the flow to move to next task.

After spending some time I realized it may the issue of the private variables whose data type was (unavailable), as I copied the CSHS from another process app and copied only those data types which was used in coach UI. The moment I deleted those variables with unavailable datatypes, the process task also finished successfully :)

Learning:
1. Find any variables with unavailable data type
2. either remove them if unused (in my case) or you need to define (or copy) the required data type.

Cheers, Saroj

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