Smart Narrative - Query (803,3) Error

Hello All,

I am trying to create a smart narrative visual on a page where I have 3 different line chart visuals (with forecast feature turned on) . When I try to insert a smart narrative visual (hoping it would create a summary for all three visuals) I get an error. (please see attached image)

I turned on Smart Narrative header icon and interestingly each visual shows summary when I check it in the header icon. Another thing I have tried is - if I remove any one visual out of the three the smart narrative visual starts working. Also if I generate summary for each visual as a separate smart narrative that works too. 

Has anyone faced this issue? I would appreciate any inputs to resolve this. 

Thank you!