TypeError: Error #2007: Parameter hitTestObject must be non-null
I am making a game for with AS3 and have only been doing it for a week but I always get this problem and there is always a different solution each time. could someone help me out. here is the source code(frame 2 of 3 where the main problem is on line 192):
full error:
TypeError: Error #2007: Parameter hitTestObject must be non-null.
at flash.display::DisplayObject/_hitTest()
at flash.display::DisplayObject/hitTestObject()
at collisionwallgame_fla::MainTimeline/greenwinZone()
source code:
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.display.Sprite;
import flash.events.MouseEvent;
stop();
var hero:Sprite = new Sprite ;
var characterSpeed:int = 7;
//var prevX:Number = 0;
//var prevY:Number = 0;
hero.x = 133.35;
hero.y = 188;
addChild(hero);
//keyboard movements
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyboardCommands);
function keyboardCommands(e:KeyboardEvent):void
{
if (e.keyCode == Keyboard.LEFT)
{
hero.x -= 5;
}
if (e.keyCode == Keyboard.RIGHT)
{
hero.x += 5;
}
if (e.keyCode == Keyboard.UP)
{
hero.y -= 5;
}
if (e.keyCode == Keyboard.DOWN)
{
hero.y += 5;
}
}
//wall collision detection
stage.addEventListener(Event.ENTER_FRAME, wallblock);
/*function resetXY():void
{
trace(hero.x +" "+prevX);
hero.x = prevX;
hero.y = prevY;
}*/
function wallblock(e:Event)
{
if (hero.hitTestObject(wall1))
{
//prevX = hero.x;
//prevY = hero.y;
hero.x += 7.5;
}
/*{
resetXY()
}*/
if (hero.hitTestObject(wall2))
{
hero.y -= 7.5;
}
if (hero.hitTestObject(wall3))
{
hero.x += 7.5;
}
if (hero.hitTestObject(wall4))
{
hero.y -= 7.5;
}
if (hero.hitTestObject(wall5))
{
hero.y -= 7.5;
}
if (hero.hitTestObject(wall6))
{
hero.y -= 7.5;
}
if (hero.hitTestObject(wall7))
{
hero.y -= 7.5;
}
if (hero.hitTestObject(wall8))
{
hero.x -= 7.5;
}
if (hero.hitTestObject(wall9))
{
hero.y -= 7.5;
}
if (hero.hitTestObject(wall10))
{
hero.x -= 7.5;
}
if (hero.hitTestObject(wall11))
{
hero.y += 7.5;
}
if (hero.hitTestObject(wall12))
{
hero.x -= 7.5;
}
if (hero.hitTestObject(wall13))
{
hero.x -= 7.5;
}
if (hero.hitTestObject(wall14))
{
hero.y += 7.5;
}
if (hero.hitTestObject(wall15))
{
hero.y += 7.5;
}
if (hero.hitTestObject(wall16))
{
hero.y += 7.5;
}
if (hero.hitTestObject(wall17))
{
hero.x += 7.5;
}
if (hero.hitTestObject(wall18))
{
hero.y += 7.5;
}
}
//adding in enemy sprites
var enemySpeed:int = 2;
var Enemy1:Enemyclass1 = new Enemyclass1 ;
var Enemy2:Enemyclass1 = new Enemyclass1 ;
var Enemy3:Enemyclass1 = new Enemyclass1 ;
var Enemy4:Enemyclass2 = new Enemyclass2 ;
var Enemy5:Enemyclass2 = new Enemyclass2 ;
Enemy1.x = 187;
Enemy1.y = 116;
Enemy2.x = 271;
Enemy2.y = 116;
Enemy3.x = 349;
Enemy3.y = 116;
Enemy4.x = 219;
Enemy4.y = 260;
Enemy5.x = 309;
Enemy5.y = 260;
addChild(Enemy1);
addChild(Enemy2);
addChild(Enemy3);
addChild(Enemy4);
addChild(Enemy5);
function terminate():void
{
gotoAndStop(3);
trace("hit");
removeChild(Enemy1);
removeChild(Enemy2);
removeChild(Enemy3);
removeChild(Enemy4);
removeChild(Enemy5);
removeChild(hero);
stage.removeEventListener(KeyboardEvent.KEY_DOWN, keyboardCommands);
stage.removeEventListener(Event.ENTER_FRAME, wallblock);
hero.removeEventListener(Event.ENTER_FRAME, enemyhit);
}
//code that advances you to the next screen)
stage.addEventListener(Event.ENTER_FRAME, greenwinZone)
function greenwinZone(e:Event):void
{
if (hero.hitTestObject(greenwinzone)) <============================================= LINE 192
{
gotoAndStop(4);
trace("hit");
removeChild(Enemy1);
removeChild(Enemy2);
removeChild(Enemy3);
removeChild(Enemy4);
removeChild(Enemy5);
removeChild(hero);
stage.removeEventListener(KeyboardEvent.KEY_DOWN, keyboardCommands);
stage.removeEventListener(Event.ENTER_FRAME, wallblock);
hero.removeEventListener(Event.ENTER_FRAME, enemyhit);
hero.removeEventListener(Event.ENTER_FRAME, greenwinZone);
}
}
//enemy collision
hero.addEventListener(Event.ENTER_FRAME, enemyhit);
function enemyhit(e:Event):void
{
if (hero.hitTestObject(Enemy1))
{
terminate();
}
if (hero.hitTestObject(Enemy2))
{
terminate();
}
if (hero.hitTestObject(Enemy3))
{
terminate();
}
if (hero.hitTestObject(Enemy4))
{
terminate();
}
if (hero.hitTestObject(Enemy5))
{
terminate();
}
}
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