Search:

I'm not sure what you mean by that. methods are not repainted.

At line 19 the code improperly used a null value, possibly contained in a variable. Look at line 19 and find where the null value is and backtrack in the code to see where it came from.

Please copy the full text of the error message and paste it here. It has important info about the error.
To call a method in another class, the code needs a reference to the instance of the other...