Thread: My image doesn't always appear on the screen?

Hi guys I've been having this problem lately with an image I added to my panel. Whenever I compile and run my program the image sometimes appear on screen but most of the time it doesn't. I really don't know what's going on so I would really appreciate the help

*The dimension of the image is 500x256

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
 
public class GameMainZombie {
 
	public static void main(String[] args)	{
 
	GameMainZombieGUI();
 
	}
 
	public static void GameMainZombieGUI() {
 
	try	{
	final JFrame pageMain = new JFrame("ZOMBIE GAME");
	pageMain.setVisible(true);
	pageMain.setSize(500,600);
	pageMain.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
	JPanel panel = new JPanel((LayoutManager) new GridBagLayout());
	pageMain.getContentPane().add(panel, BorderLayout.CENTER);
	GridBagConstraints c = new GridBagConstraints();
 
	JButton Start = new JButton("START GAME");
	Start.addActionListener(new ActionListener() { 
		public void actionPerformed(ActionEvent e)	{
		GameLocationGUI(); pageMain.setVisible(false);	}
	});
	c.gridx = 0;
	c.gridy = 1;
	c.insets = new Insets(10,10,10,10);
	panel.add(Start, c);
 
	ImageIcon image = new ImageIcon("Zombies.jpg");
	JLabel main = new JLabel(image);
	c.gridx = 0;
	c.gridy = 0;
	panel.add(main, c);
 
	}catch(Exception e)	{}
 
	}