Process Report, Report Type: Task, Context Type: Tasks assigned to group

Hi,  I have created a process report.

 

I was able to see the list of the task assigned to the group in the report 

but I wanna use this report in my interface to allow the supervisor group to approve the leave.

but I encountered the error message as 

Empty context passed in for report LM Supervisor Task Report [id=4256]. (APNX-1-4156-000)]

anyone can guide or teach me how to do ? 

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