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VIDEOIO ERROR: V4L: can't open camera by index 0

Hello,

I'm triggering a Python file with PHP.

$return = shell_exec("/usr/bin/python3.6 create.py 2>&1")

Python File

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

while(True):

    ret, frame = cap.read()

    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

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

cap.release()
cv2.destroyAllWindows()

Return this value

VIDEOIO ERROR: V4L: can't open camera by index 0

What is the problem?