error: (-215:Assertion failed) size.width>0 && size.height>0 in function ‘cv::imshow‘ inshow错误

import cv2 as cv img = cv.imread("a.jpg") cv.namedWindow("input image", cv.WINDOW_AUTOSIZE) cv.imshow("input image", img) cv.waitKey(0) cv.destroyAllWindows() 运行错误: cv.imshow(“input image”, img) cv2.
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