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cv2 assertion failed

import cv
cv2.CascadeClassifier('haarcascade_frontalface_default.xml') # try downloading the xml file again and make sure to put it in the same directory
cap = cv2.Videocapture(0) # change this value to 1 or -1 or 0 based on your os
cv2.imread('image')# check the spelling and make sure that the image is in the same directory

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cv2 assertion failed

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