求各位帮助。这两天刚刚学习python opencv调用摄像头的时候出了一个问题。cv2.error: Unknown C++ exception from OpenCV code

求帮助

贴一下代码：

import cv2 as cv  
import numpy as np
cap = cv.VideoCapture(0,cv.CAP_DSHOW)

cap.open(0)

while cap.isOpened():
    
    flag, frame = cap.read()
    if not flag:
        break
    
    key_pressed = cv.waitKey(60)
     
    print('键盘上按下的键是：',key_pressed)
   # frame = cv.Canny(frame,100,200)
    #frame = np.dstack((frame,frame,frame))
    cv.imshow('my_window',frame)
    
    if key_pressed == 27:
        
        break

cap.release( )
cv.destroyALLWindows( )

这个截图是安装的库

已解决谢谢大家