How to install Slick2d?

Hi I'm trying to create a game using the LWJGL library and the Slick2D game library however when I attempt to run it I get an error. Here is my code:

package test;

import org.newdawn.slick.AppGameContainer;
import org.newdawn.slick.BasicGame;
import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.SlickException;

public class SetupClass extends BasicGame {

public SetupClass(String title) {
    super(title);
    // TODO Auto-generated constructor stub
}

@Override
public void init(GameContainer container) throws SlickException {
    // TODO Auto-generated method stub

}

@Override
//Delta is the amount of time that has passed since the last update
public void update(GameContainer container, int delta) throws SlickException {
    // TODO Auto-generated method stub

}

@Override
public void render(GameContainer container, Graphics arg1) throws SlickException {
    // TODO Auto-generated method stub

}
//need to handle throwing slick exception so we handled it through main throwing slickexception
public static void main(String[] args) throws SlickException {
    //Create a new game container named app under a new SetupClass named Setup Test
    AppGameContainer app = new AppGameContainer(new SetupClass("Setup Test"));
    //arguments 1 and 2 are resolution of window by height and width
    //3rd argument is the boolean determining whether it is full screen
    app.setDisplayMode(800, 600, false);
    //Start the app
    app.start();

 }



}

And this is the error I get when running it:

Error: Could not find or load main class path>.native.<macosx>

Though no errors come up inside the code before running, and I don't know where I should look to fix this as it appears to be a path error. Thanks.

How to install Slick 2D

Download Slick from the official website: http://slick.ninjacave.com/
Import the externals JARs ibxm.jar, lwjgl.jar, slick.jar. They are on slick/lib.
Unzip your natives library, for example natives-linux if you use linux.
Create a folder inside your project and past it your unzipped natives library.
If your IDE haven't create automaticly the link to your natives library, do it.

Don't miss the 4th and the 5th parts or you can have an error like that:

Error: Could not find or load main class path>.native.<macosx>

Example for the last step with Eclipse:

Now that should work. Your code work fine for me, but you haven't set the number of FPS so my CPU work at 100%.

You can try to run this program:

import java.awt.Dimension;
import java.awt.Toolkit;
import org.newdawn.slick.AppGameContainer;
import org.newdawn.slick.BasicGame;
import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.SlickException;


public class Test extends BasicGame
{
    private static Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

    public Test()
    {
        super("Game");
    }

    public static void main(String[] arguments)
    {
        try
        {
            AppGameContainer app = new AppGameContainer(new Test());
            // app.setDisplayMode(screenSize.width, screenSize.height, true); => Full screen
            app.setDisplayMode(640, 480, false);
            app.setShowFPS(false); // true for display the numbers of FPS
            app.setVSync(true); // false for disable the FPS synchronize
            app.start();
        }
        catch (SlickException e)
        {
            e.printStackTrace();
        }
    }

    public void init(GameContainer container) throws SlickException
    {

    }

    public void update(GameContainer container, int delta) throws SlickException
    {

    }

    public void render(GameContainer container, Graphics g) throws SlickException
    {

    }
}