Error: camera index out of range (hand gesture control drone with python)

Question

I make hand gesture control with python. I'm using DJI TELLO DRONE. But my codes have Error with camera index out of range. Here is my code.

import cv2
import mediapipe as mp
from djitellopy import tello


mp_drawing = mp.solutions.drawing_utils
mp_drawing_styles = mp.solutions.drawing_styles
mp_hands = mp.solutions.hands
hands = mp_hands.Hands(model_complexity=0,min_detection_confidence=0.5,min_tracking_confidence=0.5,max_num_hands=1)
cap = cv2.VideoCapture(0)
width = 720
height = 280
cap.set(cv2.CAP_PROP_FRAME_WIDTH, width)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, height)
me = tello.Tello()
me.connect()
me.streamoff()
me.streamon()
isDroneFlying = False

def droneGestureController(image):
    image.flags.writeable = False
    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
    results = hands.process(image)
    image.flags.writeable = True
    image = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)
    if results.multi_hand_landmarks:

        for hand_landmarks in results.multi_hand_landmarks:
            mp_drawing.draw_landmarks(image, hand_landmarks, mp_hands.HAND_CONNECTIONS,
                                      mp_drawing_styles.get_default_hand_landmarks_style(),
                                      mp_drawing_styles.get_default_hand_connections_style())
            handlms = []

            c = 0
            for i in hand_landmarks.landmark:
                height, width, fc = image.shape
                x = (i.x) * width
                y = (i.y) * height
                handlms.append([c, int(x), int(y)])
                c = c + 1
            totalFingers = 0

            if (len(handlms) != 0):
                fingerTips = [8, 12, 16, 20]
                if(handlms[4][1]>handlms[3][1]):
                    totalFingers+=1

                for i in fingerTips:
                    if (handlms[i][2] < handlms[i - 2][2]):
                        totalFingers += 1

            droneAction = ""

            if (totalFingers==0):
                droneAction="Land"
                me.land()

            elif (totalFingers == 1):
                droneAction = "Move forward"
                me.send_rc_control(0,30,0,0)

            elif (totalFingers == 2):
                droneAction = "Move backward"
                me.send_rc_control(0, -30, 0, 0)

            elif (totalFingers == 3):
                droneAction = "Left"
                me.send_rc_control(-30, 0, 0, 0)

            elif(totalFingers == 4):
                droneAction = "Right"
                me.send_rc_control(30, 0, 0, 0)

            elif(totalFingers==5):
                droneAction = "Takeoff"
                me.takeoff()
                me.send_rc_control(0, 0, 50, 0)

            else:
                droneAction = "No Action"

            cv2.putText(image, droneAction+" "+str(totalFingers), (10, 25), cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 0, 0), 2, cv2.LINE_AA)
            return [image,handlms]
        return [image,[0]]
    return [image,[0]]

while True:
    try:
        success, image = cap.read()
        droneImage = me.get_frame_read().frame
        droneImage = cv2.resize(droneImage, (360, 240))
        image = droneGestureController(image)[0]
        isDroneFlying = True
        cv2.imshow('YourPC', image)
        cv2.imshow('Drone', droneImage)
        k = cv2.waitKey(1) & 0xFF
        if k == 27:
            cv2.destroyAllWindows()
            break
    except:
        continue
cap.release()

And here is my error message:

'[ERROR:0@0.909] global obsensor_uvc_stream_channel.cpp:156 cv::obsensor::getStreamChannelGroup Camera index out of range'

What's the problem with my code?

I tried cap = cv2.VideoCapture(0) to change cap = cv2.VideoCapture(1) but it didn't work. I also tried adding this import from pathlib import Path but it didn't work too.