import greenfoot.*;

public class Scroller
{
    private World world; // view window world
    private GreenfootImage scrollImage; // scrolling image
    private boolean limited; // flag to indicate whether scrolling is limited or not
    private int scrolledX, scrolledY; // current scrolled distances
    private int wide, high; // if limited, dimensions of scrolling area else of image to wrap
    

    public Scroller(World viewWorld, GreenfootImage image)
    {
        world = viewWorld;
        scrollImage = image;
        if (image != null)
        {
            wide = image.getWidth();
            high = image.getHeight();
        }
        [u]scroll[/u](0, 0); // sets initial background image
    }
}

scroll is still underlined and it says that it doesnt know a method scroll(int/int)
    

    import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class MyWorld here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class MyWorld extends World
{
public static final int WIDE = 1500;
public static final int HIGH = 750;
Scroller scroller;
    
    public MyWorld()
    {    
      
    
    
        super(WIDE, HIGH, 1, false) ;
      GreenfootImage image = new    GreenfootImage("greenLandscapewithbrown1.0.jpg");
      scroller = new Scroller(this,image);
    }
    
    public void act()
    {
     scroll();   
    }
    private void scroll()
    {
     int rate = 2;
     int dsx = 0;
     if(Greenfoot.isKeyDown("W")) dsx ++;
     if(Greenfoot.isKeyDown("S")) dsx --;
     scroller[u].scroll[/u](dsx*rate, 0);
    }
    
}