cv2读取图片报错cv2.error: OpenCV(3.4.2)c:\projects\opencv-python\opencv\modules\imgproc\src\color.hpp:253: error:

Traceback (most recent call last):
File "C:/Users/赵立敏/PycharmProjects/OpenCV/4.图像特征与目标检测/4.5人脸检测算法.py", line 31, in <module>
img_gray = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY)
cv2.error: OpenCV(3.4.2) c:\projects\opencv-python\opencv\modules\imgproc\src\color.hpp:253: error: (-215:Assertion failed) VScn::contains(scn) && VDcn::contains(dcn) && VDepth::contains(depth) in function 'cv::CvtHelper<struct cv::Set<3,4,-1>,struct cv::Set<1,-1,-1>,struct cv::Set<0,2,5>,2>::CvtHelper'

报错原因：没有读取到图片

解决方法：把图片放到其他路径下，而且路径中不能出现中文