functions file and NullReferenceException: Object reference not set to an instance of an object

Hi
I have js script with some common function I would like to use on other function.
In other function im adding

var funkcje: funkcje

and then late try to use function from my funkcje file like this

funkcje.startA();

But I still get

NullReferenceException: Object reference not set to an instance of an object

Why? Am I doing something wrong?

You declared a variable ‘funkcje’, but you haven’t assigned anything to it. Your variable is null. You have to assign a value to it before accessing its members.