CodingForums.com - Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

I am getting a "Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException" error, and I need some help. I have tried everything I could think of, and it won't fix it.

Code:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

        at AbstractGame.refreshWindow(AbstractGame.java:20)

        at ChessGame.actionMove(ChessGame.java:293)

        at SquareClick.actionPerformed(SquareClick.java:27)

        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.JToggleButton$ToggleButtonModel.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.Window.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)

Code:

public abstract class AbstractGame {



        public abstract void RunGame(windowControler win);

        protected abstract void display();

        protected abstract boolean tryMove();

        protected abstract boolean clearMovePath(int curY, int curX, int newY, int newX);

        protected abstract void getMoveInfo();

        protected abstract void actionMove();

        

        protected void switchPlayers() {

                if(player == 1)

                        player = 2;

                else

                        player = 1;

        }

        

        protected void refreshWindow() {

                //try {

                        win.refresh(GB.Display(this));

                //}

                //catch(Exception e) {System.out.println("DEBUGGING: Error on window refresh");}

        }

        

        protected int cY = 111, cX = 111, nY = 111, nX = 111; // some stupid number so I know it isn't set

        protected int player = 1; // Defaults to 1

        GameBoard GB;

        boolean CheckMate = false;

        boolean castle = false;

        protected boolean exitGame;

        protected windowControler win;

        boolean hasJumps;

}

actionMove from ChessGame.java

Code:

protected void actionMove() {

                if(tryMove() & !CheckMate) {

                        switchPlayers();

                }

                this.refreshWindow();

        }

Code:

import java.awt.Frame;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;



import javax.swing.JOptionPane;





public class SquareClick implements ActionListener {



        public SquareClick(AbstractGame game, int x, int y) {

                this.x = x;

                this.y = y;

                myGame = game;

        }

        public void actionPerformed(ActionEvent e) {

                if(myGame.cX == 111 & myGame.cY == 111 & myGame.nX == 111 & myGame.nY == 111) { // Empty values, set initial

                        myGame.cX = this.x;

                        myGame.cY = this.y;

                        //JOptionPane.showOptionDialog(frame, "First cood!", "HELLO!", 

                        //                JOptionPane.OK_OPTION,JOptionPane.INFORMATION_MESSAGE, null, null, e);

                }

                else if(myGame.cX != 111 & myGame.cY != 111 & myGame.nX == 111 & myGame.nY == 111) { // set the new location

                        myGame.nX = this.x;

                        myGame.nY = this.y;

                        JOptionPane.showOptionDialog(frame, myGame.cX + " " + myGame.cY + " " + myGame.nX + " " + myGame.nY, "HELLO!", 

                                        JOptionPane.OK_OPTION,JOptionPane.QUESTION_MESSAGE, null, null, e);

                        myGame.actionMove();

                        myGame.cX = 111;

                        myGame.cY = 111;

                        myGame.nX = 111;

                        myGame.nX = 111;

                        //myGame.refreshWindow();

                }

        }

        protected int x, y;

        AbstractGame myGame;

        Frame frame = new Frame();



}