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好不容易装好了环境但是这个代码却一直报错是什么原因啊 
源码: 
import cv2 as cv 
img = cv.imread("D:/测试/.png") 
cv.namedWindow("Image") 
cv.imshow("Image",img) 
cv.waitKey(0) 
cv2.destroyAllWindows(). 
报错: 
D:\untitled\venv\Scripts\python.exe D:/untitled/1.py 
Traceback (most recent call last): 
  File "D:/untitled/1.py", line 4, in <module> 
    cv.imshow("Image",img) 
cv2.error: OpenCV(4.5.1) C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-oduouqig\opencv\modules\highgui\src\window.cpp:376: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow' 
 
 
Process finished with exit code 1 
跪求大佬,万分感谢 
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