TypeError: Error #1009: Cannot access a property or method of a null object reference.
Hello
I am currently producing an ECard for my school assignment but I kept receiving this error at the output box.
When I click on my wood movie clip after a number of times in the Campfire class,it's suppose to change visibility of the sad/Happy Protag of the Protagonist class but the error kept popping up. Anyway to solve this problem?
Campfire class:
package {
import flash.display.*;
import flash.events.*;
import flash.sampler.NewObjectSample;
public class Campfire extends MovieClip {
// Properties
private var fire: Fire;
private var wood: Wood;
private var spark: Spark;
private var sparks: Array = new Array;
private var sparksLeft: int;
private var protagonist: Protagonist;
// Constructor
public function Campfire() {
sparksLeft = 3;
this.addEventListener(MouseEvent.CLICK, activateSpark);
this.addEventListener(MouseEvent.CLICK, activateFire);
this.addEventListener(Event.ADDED_TO_STAGE, addedToStageHandler);
}
// Methods
// Method: Create wood onto stage
private function addedToStageHandler(evt: Event): void {
wood = new Wood();
wood.x = 170;
wood.y = 150;
addChild(wood);
}
// Method: Create spark onto stage
public function activateSpark(evt: MouseEvent): void {
var i: int = 0;
spark = new Spark();
spark.x = (Math.random() * 50) + 200;
spark.y = 140;
addChild(spark);
sparks.push(spark);
sparksLeft = sparksLeft - 1;
}
// Method: Setter method for campfire
public function setProtagonist(iProtagonist): void {
protagonist = iProtagonist;
}
public function activateFire(evt: MouseEvent): void {
if (sparksLeft == 0) {
fire = new Fire();
fire.x = 200;
fire.y = 132;
addChild(fire)
this.removeEventListener(MouseEvent.CLICK, activateSpark);
this.removeEventListener(MouseEvent.CLICK, activateFire);
protagonist.changeToHappyProtag();
}
}
}
}
Protagonist Class
package {
import flash.events.Event;
import flash.display.MovieClip;
public class Protagonist extends MovieClip {
// Properties
private var happyPtg: HappyProtag;
private var sadPtg: SadProtag;
// Constructor
public function Protagonist() {
this.addEventListener(Event.ADDED_TO_STAGE, addedToStageHandler);
}
// Methods
// Method: Create sad protagonist
private function addedToStageHandler(evt: Event): void {
sadPtg = new SadProtag();
sadPtg.x = 185;
sadPtg.y = 80;
addChild(sadPtg);
happyPtg = new HappyProtag();
happyPtg.x = 185;
happyPtg.y = 80;
addChild(happyPtg);
sadPtg.visible = true;
happyPtg.visible = false;
}
// Method: Change into happy protagonist
public function changeToHappyProtag() {
sadPtg.visible = false;
happyPtg.visible = true;
}
}
}
Main Class
package {
import flash.display.*;
import flash.events.*;
public class Main extends MovieClip {
// Properties
private var campfire:Campfire;
private var protagonist:Protagonist;
// Constructor
public function Main() {
// Create objects onto stage
this.addEventListener(Event.ADDED_TO_STAGE, addedToStageHandler);
}
// Methods
// Method: Creating objects
private function addedToStageHandler(evt:Event):void {
// Create protagonist
protagonist = new Protagonist();
protagonist.x = 0;
protagonist.y = 0;
addChild(protagonist)
// Create campfire
campfire = new Campfire();
campfire.x = 0;
campfire.y = 0;
addChild(campfire);
}
}
}
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