chart problems - when using external database (Mysql)

hi, everybody ;  When I  using the pie chart ,  I wanna using the data from local MYSQL database , And I have create a new “excute query ” by “DATABASE CONNERCTOR  moulde . the problem is when I  choose the data source , I select microflow as what I just create , but i can’t fill the Data point . it’s dark and can’t be edited .  could you please tell me why ?   and what’s the correct method to show external data by charts ? thanks .
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