Error cv::contourArea

[khacson]

$ python code.py
Traceback (most recent call last):
File "code.py", line 47, in
if cv2.contourArea(c) < 600:
cv2.error: OpenCV(4.1.0) C:\projects\opencv-python\opencv\modules\imgproc\src\shapedescr.cpp:274: error: (-215:Assertion failed) npoints >= 0 && (depth == CV_32F || depth == CV_32S) in function 'cv::contourArea'

[ WARN:1] terminating async callback

[DevashishPrasad]

This is happening because of version issues. You may find some solutions
here

[DevashishPrasad]

Please go through the following link
https://stackoverflow.com/questions/39475125/compatibility-issue-with-contourarea-in-opencv-3

In Opencv 3 API version the cv2.findContours() returns 3 objects

Check you Opencv version