Problem with a program

Hi there. I'm new to IntelliJ IDEA, and I have a problem when running simple program composed of 3 classes:

import java.awt.*;
import javax.swing.*;

public class Program {

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            public void run() {

                Frame frame = new Frame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }

}

import java.awt.*;
import javax.swing.*;

public class Frame extends JFrame {

    public Frame() {
        setSize(600, 500);

        panel = new JPanel();
        add(panel, BorderLayout.CENTER);

        Action firstAction = new Action("One", new ImageIcon("adin.png"));
        Action secondAction = new Action("Two", new ImageIcon("dwa.png"));
        Action thirdAction = new Action("Three", new ImageIcon("tri.png"));

        JToolBar bar = new JToolBar();
        bar.add(firstAction);
        bar.add(secondAction);
        bar.add(thirdAction);
        add(bar, BorderLayout.WEST);
    }

    private JPanel panel;
}

import java.awt.event.*;
import javax.swing.*;

public class Action extends AbstractAction {

    public Action(String name, Icon icon) {

        putValue(Action.NAME, name);
        putValue(Action.SMALL_ICON, icon);
    }

    public void actionPerformed(ActionEvent event) {

        //kod
    }

}