[Python] error at : gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) [closed]

this Pycharm code line is not working (gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) photo of the error:

Image of the error

I left some possibles solution to this problem at the bottom of the question, in the answers section, I hope it works for you .

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