cv2.error: OpenCV(3.4.3) C:projectsopencv-python opencv modules high guisrc window.cpp:356...

cv2.error: OpenCV(3.4.3) C:projectsopencv-pythonopencvmoduleshighguisrcwindow.cpp:356: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow'

import cv2 as cv
from matplotlib import pyplot as plt

# Draw a histogram
def hist_image(image):
    color = ('blue', 'green', 'red')
    for i, color in enumerate(color):
        hist = cv.calcHist([image], [i], None, [256], [0, 256])
        plt.plot(hist, color=color)
        plt.xlim([0, 256])
    plt.show()

src = cv.imread(r'D:\pic\图片.jpg')
cv.namedWindow('y', cv.WINDOW_NORMAL)
cv.imshow('y', src)
hist_image(src)
cv.waitKey(0)
cv.destroyAllWindow()