python_openCV例程遇到:'cv::CascadeClassifier::detectMultiScale'

E:\Python37\python.exe E:/Python37/untitled/FaceDemo.py Traceback (most recent call last): File “E:/Python37/untitled/FaceDemo.py”, line 24, in faces = face.detectMultiScale(gray,1.1,3) cv2.error: Ope
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