AttributeError: 'DemoGui' object has no attribute 'elapsed'
I am on Mac OSx Mojave and python version 3.6.8. I tried to run the program using the following command but got error
AttributeError: 'DemoGui' object has no attribute 'elapsed'. Running the same command in python 2.7 also gives an error.
Screenshot is attached here. Any idea what am I doing wrong?