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(-215:Assertion failed) npoints >= 0 && (depth == CV_32F || depth == CV_32S) in function 'contourArea' [duplicate]

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I am trying to run the website code to create the image.

When I run the code it gives me an error:

cv2.error: OpenCV(4.1.0) 
/Users/travis/build/skvark/opencv-python/opencv/modules/imgproc/src/shapedescr.cpp:274: 
error: (-215:Assertion failed) npoints >= 0 && (depth == CV_32F || depth == CV_32S) 
in function 'contourArea'

I am not sure about the reason behind it.