slick2d problem getting an error

im running through some video tutorials on youtube with slick 2d and im running into a problem i did everything like the guy said and his runs fine but mine gives me all these

Exception in thread "main" java.lang.NoSuchMethodError: getPointer
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary1(Unknown Source)
at java.lang.ClassLoader.loadLibrary0(Unknown Source)
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at org.lwjgl.Sys$1.run(Sys.java:75)
at java.security.AccessController.doPrivileged(Native Method)
at org.lwjgl.Sys.doLoadLibrary(Sys.java:68)
at org.lwjgl.Sys.loadLibrary(Sys.java:84)
at org.lwjgl.Sys.<clinit>(Sys.java:101)
at org.lwjgl.opengl.Display.<clinit>(Display.java:128 )
at org.newdawn.slick.AppGameContainer$1.run(AppGameCo ntainer.java:39)
at java.security.AccessController.doPrivileged(Native Method)
at org.newdawn.slick.AppGameContainer.<clinit>(AppGam eContainer.java:36)
at javagame.Game.main(Game.java:27)


these are my 3 files codes

Game.java

Code :

---

package javagame;
 
import org.newdawn.slick.*;
import org.newdawn.slick.state.*;
 
public class Game extends StateBasedGame {
 
	public static final String gamename = "Ham Blaster!";
	public static final int menu = 0;
	public static final int play = 1;
 
	public Game(String gamename) {
		super(gamename);
		this.addState(new Menu(menu));
		this.addState(new Play(play));
	}
 
	public void initStatesList(GameContainer gc) throws SlickException {
		this.getState(menu).init(gc, this);
		this.getState(play).init(gc, this);
		this.enterState(menu);
	}
 
	public static void main(String[] args) {
		AppGameContainer appgc;
		try {
			appgc = new AppGameContainer(new Game(gamename));
			appgc.setDisplayMode(640, 360, false);
			appgc.start();
		}catch(SlickException e) {
			e.printStackTrace();
		}
	}
 
}

---

Menu.java

Code :

---

package javagame;
 
import org.newdawn.slick.*;
import org.newdawn.slick.state.*;
 
public class Menu extends BasicGameState {
 
	public Menu(int state) {
	}
 
	public void init(GameContainer gc, StateBasedGame sbg) throws SlickException {
	}
 
	public void render(GameContainer gc, StateBasedGame sbg, Graphics g) throws SlickException {
	}
 
	public void update(GameContainer gc, StateBasedGame sbg, int delta) throws SlickException {
	}
 
	public int getID() {
		return 0;
	}
 
}

---

Play.java

Code :

---

package javagame;
 
import org.newdawn.slick.*;
import org.newdawn.slick.state.*;
 
public class Play extends BasicGameState {
 
	public Play(int state) {
	}
 
	public void init(GameContainer gc, StateBasedGame sbg) throws SlickException {
	}
 
	public void render(GameContainer gc, StateBasedGame sbg, Graphics g) throws SlickException {
	}
 
	public void update(GameContainer gc, StateBasedGame sbg, int delta) throws SlickException {
	}
 
	public int getID() {
		return 1;
	}
 
}

---

anyone have any idea what my problem would be?

this is cross posted here: TheNewBoston Forum &bull; View topic - having a problem with the game dev tutorials (errors)

thanks for any kind of help :D

Quote:

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Exception in thread "main" java.lang.NoSuchMethodError: getPointer

---

That could mean the code was compiled with a version of the class that had the getPointer() method and was executed with a version of the class that does not have that method.
Can you check the version of the classes?