OpenCV中 ’cv2.CascadeClassifier‘ returned a result with an error set

環境:Anaconda3(64-bit) Spyder(Python 3.7) 從https://www.lfd.uci.edu/~gohlke/pythonlibs/中下載了opencv_python-4.2.0-cp37-cp37m-win_amd64.whl放到C:\ProgramData\Anaconda3\pkgs,在anaconda prompt(anaconda3)中輸入pip in
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