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I am working on a project image processing and i get an error when run this code.
I use python and opencv in the project.The error was,

error: D:BuildOpenCVopencv-3.2.0modulesimgprocsrccolor.cpp:9748: error: (-215) scn == 3 || scn == 4 in function cv::cvtColor

and this is the code i used,

import cv2
import numpy as np

face_cascade = cv2.CascadeClassifier('C:\Users\Hp\Downloads\haarcascade_frontalface_default.xml')
cap = cv2.VideoCapture(1)

while True:
 ret, img = cap.read()
 gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
 faces = face_cascade.detectMultiScale(gray, 1.3, 5)
 for(x,y,w,h) in faces:
 cv2.rectangle(img, (x,y),(x+w, y+h),(255,0,0), 2)
 roi_gray = gray[y:y+h, x:x+w]
 roi_color = img[y:y+h, x:x+w]

 cv2.imshow('img',img)
 k = cv2.waitkey(30) & 0xff
 if k == 27:
 break

cap.release()
cv2.destroyAllWindows()

Please help i was stucked here for 5 hrs.
Thanks.

The img variable does not contain the correct dimensions. If you have only one camera in your system use cv2.VideoCapture(0) instead of cv2.VideoCapture(1).