issue with cv2.imshow()

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I'm getting this error running the script:

Traceback (most recent call last):
  File "Object_detection_picamera.py", line 161, in <module>
    cv2.imshow('Object detector', frame)
cv2.error: OpenCV(4.4.0) /tmp/pip-install-fx8ry_hd/opencv-python/opencv/modules/highgui/src/window.cpp:651: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Cocoa support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvShowImage'

I installed opencv using pip install opencv-python after installing all the dependencies, not sure what was missing.

[woutervanranst]

same issue here

[woutervanranst]

I apt get installed the 2 packages, did an u install of opencv and reinstall opencv an it worked from there