Java Help Please

I'm having problems when I try to run my program. It compiles just fine, but when I go to run it I get this:

java.lang.NoSuchMethodError: main
Exception in thread "main"

Here is my program:

import aLibrary.*;
public class Director {[indent] private SimpleWindow window;
private GrayCircle circle;
[/indent][indent] public Director() {[indent]window = new SimpleWindow();
circle = new GrayCircle();
circle.place(window);
window.repaint();
[/indent][/indent][indent] }
[/indent]}

So after I got this I tried a much simpler 'Hello World' and I made sure it had a 'main' method.

public class HelloWorld {[indent] public static void main(String[] args) {
[/indent][indent][indent] System.out.println("Hello World!"😉;
[/indent][/indent][indent] }
[/indent]}

This program works, but the other one doesn't. I replaced the 'public Director()' with 'public void main()' but I get the same error. Can anyone tell me how to fix this? The first program runs just fine on the Solaris Machines in class, just not at home.