I’m on windows, and when running an image motion blur algorithm from the cv-python library, this error is suddenly reported.
Searching for similar problems has said that the path to read the image is wrong, and reinstalling a higher version of the cv library, but not all of them are useless.
All the functions under the cv2 class are not working.

Solution:
First:

pip uninstall opencv-python 

Then:

pip install opencv-python

Just reinstall this package. I don’t know the cause. The problem occurred after I installed the evaluations package. It should be caused by the conflict between versions
stackoverflow: https://stackoverflow.com/questions/67120450/error-2unspecified-error-the-function-is-not-implemented-rebuild-the-libra