Image matching with real-time video

Python
3

import cv2
from matplotlib import pyplot as plt
import numpy as np

cap = cv2.VideoCapture(0) #Webcam Capture
while(True):

ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

for i in range(3):
	template = cv2.imread(r'C:\Users\hp\Desktop\face'+str(i)+'.jpg',0)
	#path = r'C:\Users\hp\Desktop\face\jop2.jpg'
    

	#template = cv2.imread(path,0)
    
	w, h = template.shape[::-1]


	res = cv2.matchTemplate(gray,template,cv2.TM_SQDIFF)

	min_val, max_val, min_loc, max_loc = cv2.minMaxLoc(res)

	top_left = min_loc
	bottom_right = (top_left[0] + w, top_left[1] + h)

	cv2.rectangle(frame,top_left, bottom_right, 255, 1)
	cv2.putText(frame, 'Detected Face ID: '+str(i), (top_left[0],top_left[1]-10), 
			cv2.FONT_HERSHEY_PLAIN, 1.0, (255,255,255))


cv2.imshow('Test',frame)


if cv2.waitKey(1) & 0xFF == ord('q'):
	break

cap.release()
cv2.destroyAllWindows()

THIS ISTHE CODE BUT IT SHOWS THE ERROR AttributeError: ‘NoneType’ object has no attribute ‘shape’.

ICHECKED THE PATH ITS CORRECT BUTI THINK THERE IS ERROR WITH THIS ONE
template = cv2.imread(r’C:\Users\hp\Desktop\face’+str(i)+’.jpg’,0)