'NoneType' error in QuickDrawApp.py

[gautamkumarjaiswal]

In line 55 of QuickDrawApp.py (changed it to runCam.py) i was getting error "Object of type 'NoneType' has no len()". Even after modification as suggested in #6 i am getting another error "Descriptor 'len' requires a list object but received 'NoneType' ".

Solution:
I found the solution that in Opencv 4.1.0, findContours() function is returning two parameters.

changing line 54 to the following:
blackboard_cnts= cv2.findContours(thresh1.copy(), cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)[0]
solved my problem.

One suggestion: please mention the versions of the packages you are using in the requirements.

[jaehwlee]

It works at opencv 4.3.1.
thanks :)