error in action 3

error in action 3

what this  massage

TypeError: Error #1010: A term is undefined and has no properties.

    at Untitled_fla::MainTimeline/frame1()

the code

import flash.events.MouseEvent;

var questions:Array = new Array();

questions[0] = ["one",1];

questions[1] = ["two",2];

questions[2] = ["three",3];

questions[3] = ["four",4];

questions[4] = ["five",5];

var newArray:Array = new Array();

var randompos:int = 0;

for (var k: int =0; k<questions.length; k++)

{

    randompos = int(math.random() * questions.length);

    while (newArray[randompos] !=null)

    {

        randompos = int(math.random() * questions.length);

    }

    newArray[randompos] = questions;

}

var current:uint = 0;

var scr:uint = 0;

t_text.text = newArray[current][0];

score.text = String(scr) + "/" + String(newArray.length);

pre.text = String(scr) + "%";

right.buttonMode = true;

wrong.buttonMode = true;

right.addEventListener(MouseEvent.CLICK, res);

wrong.addEventListener(MouseEvent.CLICK, res);

function res(e:MouseEvent):void

{

    var id:uint = newArray[current][1];

    switch (e.currentTarget.name)

    {

        case "right":

            if (id==1 || id==2 || id==3)

            {

                scr++;

                score.text = String(scr) + "/" + String(newArray.length);

                pre.text = String(Math.round(scr/ newArray.length*100))+ "%";

                if (current <  newArray.length-1)

                {

                    current++;

                    t_text.text = newArray[current][0];

                }

                else

                {

                    right.removeEventListener(MouseEvent.CLICK, res);

                }

            }

            break;

        case "wrong":

            if (id==4 || id==5)

            {

                scr++;

                score.text = String(scr) + "/" + String(newArray.length);

                pre.text = String(Math.round(scr/ newArray.length*100))+ "%";

                if (current <  newArray.length-1)

                {

                    current++;

                    t_text.text = newArray[current][0];

            }

            else

            {

                wrong.removeEventListener(MouseEvent.CLICK, res);

            }

    }

    break;

}

}