当我尝试使用opencv一起显示2个图像时

Question

import cv2
import numpy as np,sys

img1 = cv2.imread('Pictures/orange.jpg')
img2 = cv2.imread('pictures/orange.jpg')

cv2.imshow('apple', img1)
cv2.imshow('orange', img2)
cv2.waitKey(0)

cv2.destroyAllWindows()

当我尝试运行此代码时。

---

error                                     Traceback (most recent call last)
 in ()
      6 
      7 cv2.imshow('apple', img1)
----> 8 cv2.imshow('orange', img2)
      9 cv2.waitKey(0)
     10 

error: OpenCV(3.4.1) /io/opencv/modules/highgui/src/window.cpp:356: error: (-215) size.width>0 && size.height>0 in function imshow

我收到此错误。