I wrote this simple program of facial recognition in image but haar cascade file is not loading in cascade classifier

import cv2

img = cv2.imread(“photo/3.jpg”)

grey_img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

haar_cascade = cv2.CascadeClassifier(“Haarcascade_frontalface_default.xml”)

faces_rect = haar_cascade.detectMultiScale(grey_img, 1.1, 9)

for (x, y, w, h) in faces_rect:
cv2.rectangle(img, (x, y), (x + w, y + h), (0, 255, 0), 2)

cv2.imshow(“Recognized Faces”, img)

cv2.waitKey(0)

cv2.destroyAllWindows()