I passed the required object in microflow, but it report error

I want to show a pie chart. I have an object “Program”, and an associated object named “ProgramFeedback”. ( 1..* ) I put a list view of “Program”, and I want to show the pie chart of ProgramFeedback to this “Program” This is the microflow I built. And this is the setting of my pie chart.   It reports that the microflow should pass a list of “FeedbackPieChart”, which I`ve already build in the mircoflow.   Can anyone tell me what`s wrong with it?  
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