got error in get_hand_images.py

[AnowarCST]

$ python3.6 get_hand_images.py

VIDEOIO ERROR: V4L2: Pixel format of incoming image is unsupported by OpenCV
Unable to stop the stream: Device or resource busy
VIDEOIO ERROR: V4L: can't open camera by index 0
Traceback (most recent call last):
File "get_hand_images.py", line 28, in
main()
File "get_hand_images.py", line 22, in main
cv2.imshow("Capturing gesture", frame)
cv2.error: OpenCV(3.4.3) /io/opencv/modules/highgui/src/window.cpp:356: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'

Maybe I missed something or version related problem. Could you please help me?
Thanks in advance.

[akshaybahadur21]

@AnowarCST - I think it's mostly because of the webcam.
Try restarting your webcam.
If you are using an external webcam, switch index to 1.

[akshaybahadur21]

Closing due to no further comments