Why doesn't my code work?

Question

I have a tkinter canvas and there is a button that calls miltiplayer_f function.
Here is this function: https://www.sololearn.com/post/1386429/?ref=app
Here is the error: https://www.sololearn.com/post/1386455/?ref=app

Answer 1

I need to see the code and the JSON

Answer 2

the JSON file is {}