'Null check operator used on a null value - The relevant error-causing widget was: Scaffold Scaffold

im new to flutter im trying to run an app on my mobile but having the error below

Null check operator used on a null value

The relevant error-causing widget was: Scaffold Scaffold:file:///C:/Users/Lenovo%20X1%20Carbon/Desktop/fluttergameapp/lib/Profile.dart:75:12

the code relevant to this error is : code to error



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