Java Programming

Hey all, I'm working on a mancala program for a project. I'm getting the following error:

Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException
	at Board$holeListener_03.actionPerformed(Board.java:129)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

This is where the error is pointing to:

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.Container;
import java.awt.Dimension;

public class Board extends JApplet
{
	private final int APPLET_WIDTH = 720;
	private final int APPLET_HEIGHT = 567;
	private Image board;
	Game mancala = new Game();
	
	int hole = 4;

	JButton[][] bowlBut = new JButton[2][6];
	JButton[] largeBowl = new JButton[2];

	public void init()
	{		
		Container cp = getContentPane();
		cp.repaint();
		for (int i = 0; i < 2; i++)
		{
			for(int j=0; j<6; j++)
			{
				bowlBut[i][j] = new JButton("4");				
				cp.add(bowlBut[i][j]);
			}
		}
		
		bowlBut[0][3].addActionListener (new holeListener_03());
		
		for (int i = 0; i < 2; i++)
		{
			largeBowl[i] = new JButton("0");
			cp.add(largeBowl);

		}

		cp.repaint();

						

		board = getImage (getDocumentBase(), "board.jpg");

		setSize (APPLET_WIDTH, APPLET_HEIGHT);

		

		cp.setBackground (Color.white);

		cp.setLayout (null);

		

Dimension size = bowlBut[0][0].getPreferredSize();

bowlBut[0][0].setBounds(112, 285, 50, size.height + 10);

bowlBut[0][1].setBounds(202, 285, 50, size.height + 10);

bowlBut[0][2].setBounds(290, 285, 50, size.height + 10);

bowlBut[0][3].setBounds(385, 285, 50, size.height + 10);

bowlBut[0][4].setBounds(473, 285, 50, size.height + 10);

bowlBut[0][5].setBounds(560, 285, 50, size.height + 10);



bowlBut[1][0].setBounds(112, 398, 50, size.height + 10);

bowlBut[1][1].setBounds(202, 398, 50, size.height + 10);

bowlBut[1][2].setBounds(290, 398, 50, size.height + 10);

bowlBut[1][3].setBounds(385, 398, 50, size.height + 10);

bowlBut[1][4].setBounds(473, 398, 50, size.height + 10);

bowlBut[1][5].setBounds(562, 398, 50, size.height + 10);

//to change button text: button.setText("This is a test.")







largeBowl[0].setBounds(25, 325, 50, size.height + 10);

largeBowl[1].setBounds(650, 325, 50, size.height + 10);

cp.repaint();

	}

	

	public void drawPictures(int size, Graphics page)

	{

		page.drawImage (board, 0, 0, 720, 567, this);

	}

	

	public void paint (Graphics page)

	{

		drawPictures (APPLET_WIDTH, page);

	}

	

	

	

	

	public class holeListener_03 implements ActionListener

	{

		public void actionPerformed (ActionEvent event)

		{

			System.out.println("03");

			mancala.distributeStones(3,mancala.gameBowl[0][3].getQuantity());

			refreshBowls();

		}

	}

	



	private void refreshBowls()

	{

		for (int i = 0; i < 2; i++)

		{

			for(int j=0; j<6; j++)

			{

				bowlBut[i][j].setText(""+mancala.gameBowl[i][j].getQuantity());

			}

		}

	}

}
I can post other classes if I need to. Just let me know.

Thanks in advance.