Can't acces a class because of a nameError in a undefined (event) attribute in init() of which I don't know how to define it! (Python)

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I am getting this error :

Traceback (most recent call last): File "D:\\Mario\\modules\\MovingBackground_4.py", line 54, in bg = BackgroundImage(c

Can't acces a class because of a nameError in a undefined (event) attribute in __init__() of which I don't know how to define it! (Python)