Image won't load JButton

Question

I am trying to make a main menu and i am now working on the play button. Everything works fine except that it doesn't load an image. The image is in the source folder and this is the code:

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;

public class GameFrame extends JFrame implements ActionListener{
    JButton play;
    
    GameFrame() {
        
        ImageIcon icon = new ImageIcon("playButton.png");
        
        play = new JButton();
        play.setBounds(500,100,250,100);
        play.addActionListener(this);
        play.setText("hi");
        play.setFocusable(false);
        play.setIcon(icon);
        
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setLayout(null);
        this.setSize(1000,700);
        this.setExtendedState(JFrame.MAXIMIZED_BOTH); 
        this.setUndecorated(false);
        this.setVisible(true);
        this.add(play);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==play) {
            System.out.println("hi");
        }
        
    }

}