How to add context to a task report

Question

When I run a query a!queryProcessAnalytics with parameter contextProcessModels it gives me error 
 errorMessage=contextProcessModels was not null, but the report XXXX without context [id=XXXXX] does not use a context. (APNX-1-4275-007)] 
 
 I have tried with a new task report created from scratch I can add context of process model. 
 However, I could not find a way to add context to existing task report. Is there a way to add context to existing task report. 
 
 thanks 
 Nikhil

nikhilj · Accepted Answer

I solved it by downloading the arf report editing it and then uploaded back to create new version.