the source code is:
import numpy
import cv2
cap=cv2.videoCapture(0)
while true :
ret,frame=cap.read()
gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
cv2.imshow('fram',gray)
if cv2.waitKey(1)&0xFF==ord('q'):
break
cap.release()
cv2.destroyAllWindows()
the error is: source code string cannot contain null bytes . referece to import cv2. what is the solution?