Unable to get parent

gistfile1.txt

var insert = 0;
var order = 0;
var takeSum = 0;
var storeSum = 0;
var played = false;

var img_btnPlay;
var img_btnStop;
var img_btnLegend;

var img_lvlCompletePopup;
var img_legendPopup;

//tween
var tweenItem;
var tweenPoplvl;
var tweenOutlvl;
var tweenPoplegend;
var tweenOutLegend;

//group
var group_pseudocode;
var getItem;
var answerItem;
var group_item;

var max_item = 4;
var oriX, oriY = 0;

var playState = {
  create  : function(){
    var img_level1;
    var img_btnHints;

    //textlevel
    var text_order;
    var textHint;

    //style
    var style1 = { font: "bold 64px Arial", fill: "#fff"};
    var style2 = { font: "bold 10px Arial", fill: "#fff"};

    //object
    var items = [];
    var random_item;
    var key_item = ['clothes1', 'clothes2', 'clothes3', 'clothes4'];
    group_item = this.game.add.group();
    getItem = this.game.add.group();
    answerItem = this.game.add.group();

    //pseudocodes code
    var pseudocode =  [];
    var num_pseudocode = 3; //JSON number of command depend on level
    var key_pseudocode = ['take_id', 'store_id', 'jump_id']; // JSON
    var pool_of_pseudocode = 10; //Static number of maximum object pooling
    group_pseudocode = this.game.add.group();

    //load level Background & UI
    img_level1 = this.game.add.sprite(this.world.centerX, this.world.centerY, 'level_1');
    img_btnHints = this.game.add.button(1152, this.world.centerY + 350, 'btnHints', showHint, this);
    img_btnPlay = this.game.add.button(20, this.world.centerY + 100, 'btnPlay', startCmd, this);
    img_btnStop = this.game.add.button(150, this.world.centerY + 100, 'btnStop', stopCmd, this);
    img_btnLegend = this.game.add.button(40, 20, 'btnLegend', legendPopFunc, this);
    img_legendPopup = this.game.add.sprite(this.world.centerX, this.world.centerY, 'legendPopup');
    img_lvlCompletePopup = this.game.add.sprite(this.world.centerX, this.world.centerY, 'levelCompletePopup',
      'img_lvlCompletePopup/spin/0001');
    player = this.game.add.sprite(this.world.centerX, this.world.centerY, 'mainChar');

    //add sprite for clothes
    for (var l = 0; l < max_item; l++) {
      items[l] = this.game.add.sprite(this.world.centerX - 250,
        this.world.centerY - 20 - (l * 12), this.game.rnd.pick(key_item));

        group_item.addChild(items[l]);
        this.world.bringToTop(group_item);

        items[l].anchor.setTo(.5, .5);
        items[l].scale.setTo(1, 1);
    }
    //add sprite for pseudocodes
    for (var j = 0; j < pool_of_pseudocode; j++) {
      for (var i = 0; i < num_pseudocode; i++) {
        if(i < 2){
          pseudocode[i] = this.game.add.sprite(55 + (i * 110),
            this.world.centerY + 235, key_pseudocode[i]);
        }else{
          pseudocode[i] = this.game.add.sprite(55 + ((i - 2) * 110),
            this.world.centerY + 310, key_pseudocode[i]);
        }

        pseudocode[i].anchor.setTo(.5, .5);
        pseudocode[i].scale.setTo(.6, .6);

        pseudocode[i].inputEnabled = true;
        pseudocode[i].input.enableDrag();
        pseudocode[i].events.onDragStop.add(onDragStop, this);
        pseudocode[i].events.onDragStart.add(onDragStart, this);
    }
  }

    //tween a popup after completing level & legend
    tweenPoplvl = this.game.add.tween(img_lvlCompletePopup.scale).to({x: .5, y: .5},
      5000, Phaser.Easing.Elastic.Out);
    tweenOutlvl = this.game.add.tween(img_lvlCompletePopup.scale).to({x: .1, y: .1},
      3000, Phaser.Easing.Elastic.In);
    tweenPoplegend = this.game.add.tween(img_legendPopup.scale).to({x: 1, y: 1},
      3000, "Quart.easeOut");
    tweenOutLegend = this.game.add.tween(img_legendPopup.scale).to({x: .1, y: .1},
      3000, Phaser.Easing.Elastic.In);

    player.anchor.setTo(.5,.5);
    img_level1.anchor.setTo(.5, .5);
    img_btnHints.anchor.setTo(.5, 1);
    img_lvlCompletePopup.anchor.setTo(.5, .5);
    img_legendPopup.anchor.setTo(.5, .5);

    player.scale.setTo(.5, .5);
    img_level1.scale.setTo(1, 1);
    img_btnPlay.scale.setTo(.6, .45);
    img_btnStop.scale.setTo(.6, .45);
    img_lvlCompletePopup.scale.setTo(.1, .1);
    img_legendPopup.scale.setTo(.1, .1);

    player.animations.add('walk');
    player.animations.play('walk', 3, true);

    //popup (clean it later)
    img_lvlCompletePopup.alpha = 0;
    var closelvlComplete;
    var cw =  40;
    var ch =  8;
    closelvlComplete = this.game.make.sprite(cw, -ch, 'closePopup');
    closelvlComplete.inputEnabled = true;
    closelvlComplete.input.priorityID = 1;
    closelvlComplete.input.useHandCursor = true;
    closelvlComplete.events.onInputDown.add(closePop, this);
    img_lvlCompletePopup.addChild(closelvlComplete);

    img_legendPopup.alpha = 0;
    var closeLegend;
    var lw =  250;
    var lh =  260;
    closeLegend = this.game.make.sprite(lw, -lh, 'closePopup');
    closeLegend.scale.setTo(.2, .2);
    closeLegend.inputEnabled = true;
    closeLegend.input.priorityID = 1;
    closeLegend.input.useHandCursor = true;
    closeLegend.events.onInputDown.add(closePop, this);
    img_legendPopup.addChild(closeLegend);

    img_btnPlay.FixedToCamera = true;

    img_btnPlay.input.enabled = false;
    img_btnStop.input.enabled = false;
  },

  update : function(){
  }
};

  function startCmd(){
    played = true;
    img_btnStop.input.enabled = true;
    img_btnPlay.input.enabled = false;
    this.game.time.events.repeat(Phaser.Timer.SECOND * 2, insert, _pseudoFunc, this);
    var textTest2;
  }

  function stopCmd(){
      order = 0;
      insert = 0;
      this.game.state.restart();
    }

  function showHint(img_btnHints){
    textHint = this.game.add.text(1050, this.world.centerY + 190, "Try use jump!", this.style2);
    textHint.scale.setTo(1, 1);
    img_btnHints.destroy();
  }

  function onDragStart(sprite){
    oriX = sprite.x;
    oriY = sprite.y;
  }

  function onDragStop(sprite, pointer){
    //check whether or not the pseudocode dragged within list territory
    if(sprite.x < 240 && sprite.y < 430){
      img_btnPlay.input.enabled = true; //allow to play the pseudocode
      insert += 1;
      sprite.x = 100;
      sprite.y = 190 + (80 * (insert - 1));
      text_order = this.game.add.text(12, sprite.y - 30, insert, this.style1);
      group_pseudocode.add(sprite);
      this.world.bringToTop(group_pseudocode);
      sprite.input.disableDrag();
    }else{
      //return to original position
      sprite.x = oriX;
      sprite.y = oriY;
    }
    sprite.checkWorldBounds = true;
    sprite.outOfBoundsKill = true;
  }

  function _pseudoFunc(){
      var texTest;
      switch (group_pseudocode.children[order].key){
        case 'take_id':
          if(getItem.length != 0){  //check if player hold an item
            insert = 0;
            break;
          }
          getItem.addChild(group_item.children[max_item - (takeSum + 1)]);
          group_item.remove(group_item.children[max_item - (takeSum + 1)]);
          getItem.children[0].x = this.world.centerX;
          getItem.children[0].y = 200;
          this.world.bringToTop(getItem);
          takeSum++;
        break;
        case 'store_id':
          if(getItem.length == 0){ //check if player do not hold an item
            insert = 0;
            // this.game.state.restart();
          }else{
            answerItem.addChild(getItem[0]);

            answerItem.children[storeSum].x = this.world.centerX + 300;
            answerItem.children[storeSum].y = (285 - ((storeSum + 1) * 20));
            getItem.remove(getItem.children[0]);
            storeSum++;
          }
        break;
        case 'jump_id':
          if(group_item.length == 0){
            insert = 0;
            order = 0;
            break;
          }
          var rollback = -1;
          order = rollback;
        break;
        default:
    }
    order++;
    textTest = this.game.add.text(this.world.centerX, this.world.centerY + (100 * order), order + "Order", this.style2);
  }

  function closePop(){
      img_legendPopup.alpha = 0;
      img_btnLegend.input.enabled = true;
      tweenOutLegend.start();
  }

  function legendPopFunc(){
    this.world.bringToTop(img_legendPopup);
    img_legendPopup.alpha = 1;
    img_btnLegend.input.enabled = false;
    tweenPoplegend.start();
  }