I am having a problem that I can not use cv2.imshow() because of following error message

qt.qpa.plugin: Could not find the Qt platform plugin "cocoa" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Last Macbook I was using initially did not have QT so I have no idea how should I deal with it.
Any ideas?
I had the same issue after updating opencv - python to 4.2.0.32.
Uninstall opencv-python and install the lower version (e.g pip install opencv-python==4.1.0.25) solves this issue.
OpenCV cv2.imshow is not working because of the qt