jeudi 28 mai 2015

Error when catching objects and lives count wont decrease?

I'm currently making a catching game. So the user have to catch the right letter to get a score and go to the next question. The letters are movieclips and I made the falling animation with motion tween. I converted the avatar to a movieclip too. When the avatar hits the right letter, the user will get 100 points and when the avatar hits the wrong letter, there will be a pop up button that says "try again" and it will lost its lives by 1. Here's my code:

stage.addEventListener(KeyboardEvent.KEY_DOWN, moveavatar);
avatarmove.addEventListener(Event.ENTER_FRAME, handleCollision);

trybutton.visible = false;
var myscore = 0; 
var mylives = 5;
score.text = myscore+"";
lives.text = mylives+"";

//Move avatar function
function moveavatar (event:KeyboardEvent):void
  avatarmove.x = Math.max(0,Math.min(stage.stageWidth-avatarmove.width,avatarmove.x - int(event.keyCode==37) * 10 + int(event.keyCode==39) * 10));

//Collision between the avatar and the letters
function handleCollision(e:Event):void
    a_alphabet.visible = false;
  else if(avatarmove.hitTestObject(o_alphabet))
    o_alphabet.visible = false;
    trybutton.visible = true;

//try again button
trybutton.addEventListener (MouseEvent.CLICK, ayo1);
function ayo1(event:MouseEvent):void{
  o_alphabet.visible = true;
  trybutton.visible = false;

I keep getting this error when the avatar hits the letter:

TypeError: Error #2007: Parameter hitTestObject must be non-null.
at flash.display::DisplayObject/_hitTest()
at flash.display::DisplayObject/hitTestObject()
at gamecompletethewords_fla::MainTimeline/handleCollision()

And this error on the next frame:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at gamecompletethewords_fla::MainTimeline/handleCollision2()

And the the lives won't decrease when the avatar hits the wrong letter, but when I move to the next frame it will decrease by -27. It's just really weird. Can someone help me with these problems? I'm totally new to this and I have no idea how to fix it :(

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