Reciever.py:22: DeprecationWarning: The binary mode of fromstring is deprecated, as it behaves surprisingly on unicode inputs. Use frombuffer instead
  nparr = np.fromstring(data, np.uint8)
Traceback (most recent call last):
  File "Reciever.py", line 24, in <module>
    cv2.imshow('frame', frame)
cv2.error: OpenCV(4.1.1) C:\projects\opencv-python\opencv\modules\highgui\src\window.cpp:352: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow'