Expected closing parenthesis but found

Could anyone tell me what's wrong with this custom expression?
I want to know the average of sales for each shop ("ID Number")

Hi @Dan1
There's no Count function with column arguments:
https://github.com/metabase/metabase/issues/11558 - upvote by clicking :+1: on the first post
You might be able to use Sum([sales]) / Distinct([ID Number]) but I don't know you data, so perhaps it will give wrong information.