Ambiguous error message

//The purpose of this class is to create a JButton that launches a program shortcut when it is pressed
//if there are better ways to do this, I would appreciate the help.

public class Launcherbutton extends JButton {



	public Launcherbutton() {

		addMouseListener(new MouseListener() {

			@Override
			public void mouseClicked(MouseEvent arg0) {


			}

			@Override
			public void mouseEntered(MouseEvent arg0) {


			}

			@Override
			public void mouseExited(MouseEvent arg0) {


			}

			public void mousePressed(MouseEvent arg0, String pathdir) {

				 ProcessBuilder pb = new ProcessBuilder("cmd", pathdir);//launches a .exe shortcut file from a directory

Process p = pb.start();
p.waitFor();

			}

			@Override
			public void mouseReleased(MouseEvent arg0) {


			}

			@Override
			public void mousePressed(MouseEvent e) {


			}

		}//error message occurs here
	}
}