sail error a!taskui_taskRejectionReassignment

Hi,

We have received the below error as part of lab report:

3 errors occurred in Task Form: ABC

67% of errors due to: Expression evaluation error at function a!taskui_taskRejectionReassignment: An error occurred while executing a save: The task may have been deleted or completed by another assignee.

I am looking for the cause of this issue and how we can resolve or replicate this issue? 

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