I am trying to learn how to define a global variable inside a function that is located in my locally created library .

I am working on a project of mine and I came up with a problem.
I am trying to progress my counter variable by using a global variable inside my function, it have worked totally fine (while all my functions were defined inside my main program ) until I have created my own library and transferred my functions there.

right now it approaches the function, runs it but give e the following error :

NameError: name ‘StepCounter’ is not defined

(StepCounter is defined inside the main program. it is defined as a global variable inside the function)