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I have now and it has gotten rid of the error message...But why, what's the point of that being there? If you're going to say do my own research fair enough, I will eventually learn why ;)

- Nicky

I'll start off by showing my full code:

Main class

import javax.swing.JFrame;

public class groupingTest {
public static void main (String[] args) {
groupWindow test = new groupWindow();