Error running main.py

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Ran "python2 main.py path/to/.jpg" with all dependencies inatalled.
Calls to ocv in main.py, such as;

• if cv2.contourArea(c)<80:
• x,y,w,h = cv2.boundingRect(c)

Error:
File "main.py",
x,y,w,h = cv2.boundingRect(c)
cv2.error: OpenCV(4.2.0) /io/opencv/modules/imgproc/src/shapedescr.cpp:784: error: (-215:Assertion failed) npoints >= 0 && (depth == CV_32F || depth == CV_32S) in function 'pointSetBoundingRect'

Python 2.7.18