I am using eclipse and i get this error--

I am using eclipse and i get this error--

error
Exception in thread "main" java.lang.Error: Unresolved compilation
problem: at Wall.main(Wall.java:6)
import becker.robots.*;
import javax.swing.*;
public class Wall
{
public static void main (String[] args)
{
JFrame frame = new JFrame ();
frame.setVisible(true);
JPanel panel = new JPanel ();
panel.setVisible(true);
frame.add(panel);
JColorChooser color = new JColorChooser();
panel.add(color);
}
}