File "F:/TensorFlow/test/set_other_people.py", line 41, in <module>
gray_img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
error: OpenCV(3.4.3) C:projectsopencv-pythonopencvmodulesimgprocsrccolor.cpp:181: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'
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