I am having an issue where the code I have is saying that there is a java.lang.NullPointerExpection. Could you please help
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo) /** * Write a description of class Turtleworld here. * * @author (your name) * @version (a version number or a date) */ public class Turtleworld extends World { public int TurtlesNibbled = 0; private Swag swag; /** * Constructor for objects of class Turtleworld. * */ public Turtleworld() { // Create a new world with 600x400 cells with a cell size of 1x1 pixels. super(600, 400, 1); populateWorld(); reLive(); } public void reLive() { swag.getScore(); if (TurtlesNibbled == 1) { addObject(new Turtle(), 300, 200 ); } } public void populateWorld() { addObject(new Turtle(), 300, 200 ); } }