[Python] opencv- I can't convert image to grayscale

I'm fetching a frame correctly from webcam:

success, image = self.video.read()


But when I try to change the mode of my frame to grayscale using the following code:

gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)


I get the following error:

im = im[..., ::-1].transpose((0, 3, 1, 2)) # BGR to RGB, BHWC to BCHW, (n, 3, h, w)
ValueError: axes don't match array


What seems to be the problem ?

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