Im on chapter 10 problem 45E in introduction to programming with greenfoot 2nd edition. Iin myWorld class, it says it cant find method. my code thus far.

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

/** * Write a description of class Start here. * * @author (your name) * @version (a version number or a date) */ public class Start extends Actor { public GreenfootSound sound = new GreenfootSound("SleepAWAY.mp3"); private boolean off = true; /** * Act - do whatever the Start wants to do. This method is called whenever * the 'Act' or 'Run' button gets pressed in the environment. */ public void act() { if(Greenfoot.mouseClicked(this) && off) { sound.playLoop(); off = false; } else if(Greenfoot.mouseClicked(this) && !off) { sound.pause(); off = true; } }

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 {

/** * Constructor for objects of class MyWorld. * */ public MyWorld() { // Create a new world with 600x400 cells with a cell size of 1x1 pixels. super(600, 400, 1); addObject(newStart(),400, 250); } }