Calculate total value of star ratings

Hi,  Anyone know how to calculate the total value of star rating widget? I have a list of question with the star rating. After evaluator give their marks based on the star rating, I need to sum all of the value to be a total score. If I use normal integer text box, I can easily calculate the total score. But after I add the star rating, it show that I have wrong parameter in the microflow. The attributes of star rating is score from the KE_ScoringLine entity.    
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