Traceback most recent call last File practicepy line 64 in module cnts = sortedcnts key=cv2contourArea reverse=True5cv2error OpenCV470 Daopencv-pythonopencv-pythonopencvmodulesimgprocsrcshapedescr

This error occurs in OpenCV when there is an assertion failure. In this case, the error message is indicating that the assertion failed because the number of points in the contour is less than zero and the depth is not either CV_32F or CV_32S.

To fix this error, you can check the contour before passing it to the cv2.contourArea function. You should make sure that the contour has a positive number of points and the depth is either CV_32F or CV_32S.

Here is an example of how you can check the contour:

if len(cnt) >= 0: if cnt.dtype == np.int32: cnt = cnt.astype(np.float32)

Once you have confirmed that the contour is valid, you can then pass it to the cv2.contourArea function.