Please help!! New to Flash making memory game

Trying to make this flash memory game and im a complete noob so need help. I need to reset the cards back to 10. i believe the cards is totalchildren = 10 or something but i dont know. Get errors 1119 and 1120.

import away3d.cameras.*;

import away3d.containers.*;

import away3d.materials.*;

import away3d.primitives.Plane

import away3d.primitives.Cube

import away3d.containers.ObjectContainer3D;

import away3d.core.math.Number3D;

import caurina.transitions.*

import fl.motion.MotionEvent;

var scene:Scene3D;

var camera:Camera3D;

var view:View3D;

var totalchildren:int=10

var cards:Array

var textures:Array = [ new texture0(0,0),

                                                     new texture1(0,0),

                                                     new texture2(0,0),

                                                     new texture3(0,0),

                                                     new texture4(0,0)]

var backtexture:BitmapData = new textureback(0,0)

var woodtexture:BitmapData = new texturewood(0,0)

var cardwidth:Number = 110

var cardheight:Number = 150

var xoffset:Number = 10

var yoffset:Number = 10

var cardsholder:ObjectContainer3D

var selectedCard1:Plane

var selectedCard2:Plane

var disableMouseEvents:Boolean=false

function initAway3D():void {

          scene = new Scene3D();

          camera = new Camera3D();

          camera.y = 700

          camera.z = 500

          camera.lookAt(new Number3D(0,0,0))

          view = new View3D({scene:scene, camera:camera});

          view.x = stage.stageWidth/2

          view.y = stage.stageHeight/2

          addChild(view);

}

function createGround():void {

          var cube:Cube = new Cube({width:680,depth:400,height:20,pushback:true,ownCanvas:true,material: new BitmapMaterial(woodtexture)})

          cube.y=-20

          scene.addChild(cube)

}

function createCard(texture:BitmapData,id:int):ObjectContainer3D {

          var card:ObjectContainer3D = new ObjectContainer3D()

          var front:Plane = new Plane({width:cardwidth,height:cardheight, material: new BitmapMaterial(texture,{smooth:true})})

          var back:Plane = new Plane({width:cardwidth,height:cardheight, material: new BitmapMaterial(backtexture,{smooth:true})})

          front.rotationY=180

          back.rotationZ=180

          back.rotationY=180

          back.extra = {}

          back.extra.id = id

          back.extra.targetCard = card

          back.addOnMouseDown(onBackClicked)

          card.rotationZ=180

          card.addChild(front)

          card.addChild(back)

          card.ownCanvas = true

          return card

}

function initCards():void {

          cards = new Array()

          for(var i:int = 0; i<textures.length; i++ ) {

                    var card1:ObjectContainer3D = createCard(textures,i)

                    var card2:ObjectContainer3D = createCard(textures,i)

                    cards.push( card1 )

                    cards.push( card2 )

          }

}

function randomizeCards():void{

          var newArray:Array = new Array();

          while(cards.length > 0){

                    newArray.push(cards.splice(Math.floor(Math.random()*cards.length), 1)[0]);

          }

          cards = newArray

}

function addCardsToScene():void {

          cardsholder = new ObjectContainer3D()

          var currentindex:int = 0

          for(var i:int=0; i<2; i++) {

                    for(var b:int=0; b<5; b++) {

                              cards[currentindex].x=b*(cardwidth+xoffset)+cardwidth/2

                              cards[currentindex].z=i*(cardheight+yoffset)+cardheight/2

                              cardsholder.addChild(cards[currentindex])

                              currentindex++

                    }

          }

          var cardswidth:Number = (5*cardwidth) + (4*xoffset)

          var cardsheight:Number = (2*cardheight) + (1*yoffset)

          cardsholder.x=-cardswidth/2

          cardsholder.z=-cardsheight/2

          scene.addChild(cardsholder)

}

function onBackClicked(e:Event):void {

          if(disableMouseEvents==false) {

                    if(selectedCard1==null) {

                              selectedCard1 = e.currentTarget as Plane

                    }else {

                              if(selectedCard2==null) {

                                        selectedCard2 = e.currentTarget as Plane

                                        waitForDecision()

                                        disableMouseEvents = true

                              }

                    }

                    Tweener.addTween(e.currentTarget.extra.targetCard,{y:50,rotationZ:0,time:1})

          }

}

function waitForDecision():void {

          var timer:Timer = new Timer(1000,1)

          timer.addEventListener(TimerEvent.TIMER,makeDecision)

          timer.start()

}

function makeDecision(e:Event):void {

          if(selectedCard1.extra.id == selectedCard2.extra.id) {

                    Tweener.addTween(selectedCard1.extra.targetCard,{alpha:0,time:0.2,onComplete:removeCard,onCompleteParams:[selectedCard1.extra.targetCard]})

                    Tweener.addTween(selectedCard2.extra.targetCard,{alpha:0,time:0.2,onComplete:removeCard,onCompleteParams:[selectedCard2.extra.targetCard]})

          }else {

                    Tweener.addTween(selectedCard1.extra.targetCard,{y:0,rotationZ:180,time:1})

                    Tweener.addTween(selectedCard2.extra.targetCard,{y:0,rotationZ:180,time:1})

          }

          disableMouseEvents = false

          selectedCard1 = null

          selectedCard2 = null

}

function removeCard(e:ObjectContainer3D):void {

          cardsholder.removeChild(e)

          totalchildren--

          if(totalchildren==0) {

                    trace("WIN")

          }

}

function startToRender():void {

          addEventListener(Event.ENTER_FRAME, render);

}

function render( e:Event ):void{

          view.render();

}

initAway3D()

createGround()

initCards()

randomizeCards()

addCardsToScene()

startToRender()

reset_btn.addEventListener(MouseEvent.CLICK, reset);

reset_btn.buttonMode = true;