How to solve the error Type Error #2007: Parameter hitTestObject must be non-null.
When I combine the storytelling part(storytelling that run frame by frame) with platform game, this error appear:
TypeError: Error #2007: Parameter hitTestObject must be non-null.
at flash.display:: DisplayObject/_hitTest()
at flash.display:: DisplayObject/hitTestObject()
at SaveMyBaby4_fla::Background_27/frame1()
at flash.display::MovieClip/gotoAndPlay()
at SaveMyBaby4_fla::Mainmenu_20/clickStart()
How can i solve it? As i use this coding:
var leftDown:Boolean = false;
var rightDown:Boolean = false;
var upDown:Boolean = false;
var downDown:Boolean = false;
var leftBumping:Boolean = false;
var rightBumping:Boolean = false;
var upBumping:Boolean = false;
var downBumping:Boolean = false;
var leftBumpPoint:Point = new Point(0, 0);
var rightBumpPoint:Point = new Point(0, 0);
var upBumpPoint:Point = new Point(0, 0);
var downBumpPoint:Point = new Point(0, 0);
var scrollX:Number = 500;
var scrollY:Number = 0;
var xSpeed:Number = 0;
var ySpeed:Number = 0;
var speedConstant:Number = 2;
var frictionConstant:Number = 0.9;
var gravityConstant:Number = 1.5;
var jumpConstant:Number = -35;
var maxSpeedConstant:Number = 18;
var doubleJumpReady:Boolean = false;
var upReleasedInAir:Boolean = false;
var door:Boolean = false;
var currentLevel:int = 1;
var animationState:String="rest";
function loop(e:Event):void{
if(back.block.hitTestPoint(player.x + leftBumpPoint.x, player.y + leftBumpPoint.y, true)){
//trace("leftBumping");
leftBumping = true;
} else {
leftBumping = false;
}
if(back.block.hitTestPoint(player.x + rightBumpPoint.x, player.y + rightBumpPoint.y, true)){
//trace("rightBumping");
rightBumping = true;
} else {
rightBumping = false;
}
if(back.block.hitTestPoint(player.x + upBumpPoint.x, player.y + upBumpPoint.y, true)){
//trace("upBumping");
upBumping = true;
} else {
upBumping = false;
}
if(back.block.hitTestPoint(player.x + downBumpPoint.x, player.y + downBumpPoint.y, true)){
//trace("downBumping");
downBumping = true;
} else {
downBumping = false;
}
}
if(leftDown){
xSpeed -= speedConstant;
player.scaleX = -1;
} else if(rightDown){
xSpeed += speedConstant;
player.scaleX = 1;
}
/*if(upPressed){
ySpeed -= speedConstant;
} else if(downPressed){
ySpeed += speedConstant;
}*/
if(leftBumping){
if(xSpeed < 0){
xSpeed *= -0.5;
}
}
if(rightBumping){
if(xSpeed > 0){
xSpeed *= -0.5;
}
}
if(upBumping){
if(ySpeed < 0){
ySpeed *= -0.5;
}
}
if(downBumping){ //if we are touching the floor
if(ySpeed > 0){
ySpeed = 0; //set the y speed to zero
}
if(upDown){ //and if the up arrow is pressed
ySpeed = jumpConstant; //set the y speed to the jump constant
}
//DOUBLE JUMP
if(upReleasedInAir == true){
upReleasedInAir = false;
}
if(doubleJumpReady == false){
doubleJumpReady = true;
}
} else { //if we are not touching the floor
ySpeed += gravityConstant; //accelerate downwards
//DOUBLE JUMP
if(upDown == false && upReleasedInAir == false){
upReleasedInAir = true;
//trace("upReleasedInAir");
}
if(doubleJumpReady && upReleasedInAir){
if(upDown){ //and if the up arrow is pressed
//trace("doubleJump!");
doubleJumpReady = false;
ySpeed = jumpConstant; //set the y speed to the jump constant
}
}
}
if(door == false)
{
if(player.hitTestObject(back.door))
{
door = true;
}
}
if(xSpeed > maxSpeedConstant){ //moving right
xSpeed = maxSpeedConstant;
} else if(xSpeed < (maxSpeedConstant * -1)){ //moving left
xSpeed = (maxSpeedConstant * -1);
}
xSpeed *= frictionConstant;
ySpeed *= frictionConstant;
if(Math.abs(xSpeed) < 0.5){
xSpeed = 0;
}
scrollX -= xSpeed;
scrollY -= ySpeed;
back.x = scrollX;
back.y = scrollY;
sky.x = scrollX * 0.2;
sky.y = scrollY * 0.2;
if((leftDown||rightDown||xSpeed>speedConstant||xSp eed<speedConstant*-1)&&downBumping){
animationState="playerrun";
}
else if(downBumping){
animationState="rest";
}
else{
animationState="jump";
}
if(player.currentLable!=animationState){
player.gotoAndStop(animationState);
}
function nextLevel():void{
currentLevel++;
{
gotoAndPlay(4, "Scene 1");
door = false;
}
function keyDownHandler(e:KeyboardEvent):void
{
if(e.keyCode == Keyboard.LEFT)
{
leftDown = true;
}
else if(e.keyCode == Keyboard.RIGHT)
{
rightDown = true;
}
else if(e.keyCode == Keyboard.UP)
{
upDown = true;
}
else if(e.keyCode == Keyboard.DOWN)
{
downDown= true;
if(player.hitTestObject(back.door))
{
//proceed to the next level if the player is touching an open door
door = true;
gotoAndPlay(5, "Scene 1");
}
}
}
function keyUpHandler(e:KeyboardEvent):void{
if(e.keyCode == Keyboard.LEFT){
leftDown = false;
} else if(e.keyCode == Keyboard.RIGHT){
rightDown = false;
} else if(e.keyCode == Keyboard.UP){
upDown = false;
} else if(e.keyCode == Keyboard.DOWN){
downDown = false;
}
}}
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