getting error: 'bool' object has no attribute 'astype'

[TheMayankRai]

AttributeError Traceback (most recent call last)
in
1 while True:
2 img,ret = capture.read()
----> 3 img=img.astype('uint8')
4 gray=cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
5 faces = face_cascade.detectMultiscale(gray,1.3,5)

AttributeError: 'bool' object has no attribute 'astype'