CreateJS - how to load spritesheet with createJS and run animation

Hi,

I am new to createJS and I am trying to load a spritesheet and run frames that contain an animation; but I keep getting this error in the console: "Uncaught TypeError: Cannot read property 'getImages' of undefined at Game.handleFileLoad". I am confused as to what is going on because there is no 'getImages' and so I think I am just not understanding how to load a spritesheet. Please help!

HERE IS THE CODE IN QUESTION:

loadGraphics() {
   var queue = new createjs.LoadQueue(true);
  queue.on("fileload", handleFileLoad, this);
  queue.loadFile("images/index_atlas_.png");
  queue.load();

}

handleFileLoad(event) {
   var item = event.item;
   var type = item.type;
   var image = queue.getResult(event.item);
  document.body.appendChild(image);

   var data = {
  images: [image],
  frames: {width:256, height:256},
  animations: {
  run:[0,4]
   }
   };

   var spriteSheet = new createjs.SpriteSheet(data);
   var animation = new createjs.Sprite(spriteSheet, "run");

AND HERE IS ALL OF MY CODE (IF THAT HELPS):

   class GameObject extends createjs.Container{

   constructor(graphic){
   super();
   if(graphic != undefined){
   this.graphic = graphic;
   this.addChild(this.graphic);
   var b = this.graphic.nominalBounds;
   this.setBounds(b.x, b.y, b.width, b.height);
   }

   }

}


   class Hero extends GameObject{

   constructor(){
   super(new lib.HeroGraphic());
   }

   }


   class Platform extends GameObject{

   constructor(){
   super(new lib.PlatformGraphic());
   }

   }


class World extends createjs.Container{

   constructor(){
   super();
   this.platforms = [];
   this.generatePlatforms();
   this.addHero();
   }


  addHero(){
   var hero = new Hero();
   this.addChild(hero);
  hero.x = 100;
  hero.y = 100;
   this.hero = hero;
   }

  generatePlatforms(){
   var platform = new Platform();
   this.addChild(platform);
  platform.x = 100;
  platform.y = 300;
   this.platforms.push(platform);

  platform = new Platform();
   this.addChild(platform);
  platform.x = 550;
  platform.y = 300;
   this.platforms.push(platform);
   }
   }


   class Game
   {
   constructor(lib){
   this.lib = lib;
   this.canvas = document.getElementById("canvas");
   this.stage = new createjs.Stage(this.canvas);
   this.stage.width = this.canvas.width;
   this.stage.height = this.canvas.height;
  createjs.Touch.enable(this.stage);
  createjs.Ticker.framerate = 60;
  createjs.Ticker.on("tick", this.stage);
   this.loadGraphics();
   this.restartGame();
   }

  loadGraphics() {
   var queue = new createjs.LoadQueue(true);
  queue.on("fileload", handleFileLoad, this);
  queue.loadFile("images/index_atlas_.png");
  queue.load();
   }

  handleFileLoad(event) {
   var item = event.item;
   var type = item.type;
   var image = queue.getResult(event.item);
  document.body.appendChild(image);

   var data = {
  images: [image],
  frames: {width:256, height:256},
  animations: {
  run:[0,4]
   }
   };

   var spriteSheet = new createjs.SpriteSheet(data);
   var animation = new createjs.Sprite(spriteSheet, "run");
   }


  restartGame(){

   this.world = new World();
   this.stage.addChild(this.world);
   }


   }

   var game = new Game(lib, exportRoot);