Help with game menu code

Question

Sorry if I look like a novice cause I am, I'm doing project in college can't get code to work
C:\WTK22\apps\SpaceAsteroids3MIDlet\src\AboutScreen.java:22: cannot resolve symbol
symbol : method MainMenuScreenShow ()
location: class SpaceAsteroids3MIDlet
     midlet.MainMenuScreenShow();
suppose you need source code
import javax.microedition.lcdui.*;
public class AboutScreen extends Form implements CommandListener
private SpaceAsteroids3MIDlet midlet;
private Command backCommand = new Command("Back", Command.BACK, 1);
public AboutScreen (SpaceAsteroids3MIDlet midlet)
super("About");
this.midlet = midlet;
StringItem stringItem = new StringItem(null,"Space Invaders\nVersion 1.0.0\nby Pauric Murphy");
append(stringItem);
addCommand(backCommand);
setCommandListener(this);
public void commandAction(Command c, Displayable d)
if (c == backCommand)
     midlet.MainMenuScreenShow();
     return;
here is the error it says on this page

Answer 1

MIDlet file here too
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class SpaceAsteroids3MIDlet extends MIDlet
protected Display display;
private Image introLogo;
private boolean isIntro = true;
MainMenuScreen mainMenuScreen;
public SpaceAsteroids3MIDlet()
public void startApp()
display = Display.getDisplay(this);
mainMenuScreen = new MainMenuScreen(this);
if(isIntro)
     isIntro = false;
     try
     introLogo = Image.createImage("/intro.png");
     new IntroScreen(display, mainMenuScreen, introLogo,5000);
     } catch(Exception ex)
     mainMenuScreenShow(null);
} else
     mainMenuScreenShow(null);
public Display getDisplay()
return display;
public void pauseApp()
public void destroyApp(boolean unconditional)
System.gc();
notifyDestroyed();
private Image createImage(String filename)
Image image = null;
try
     image = Image.createImage(filename);
} catch (Exception e)
return image;
public void mainMenuScreenShow(Alert alert)
if (alert==null)
     display.setCurrent(mainMenuScreen);
else
     display.setCurrent(alert,mainMenuScreen);
public void mainMenuScreenQuit()
destroyApp(true);
}