Can't create timer

For some odd reason when I try to create a timer nothing happens, so when I refer to that timer I get an error because it doesn’t exist.

This is my as code

package com.mygame.dodge
{
    import flash.display.Sprite;
    import flash.display.MovieClip;
    import flash.events.MouseEvent;
    import flash.utils.Timer;
    import flash.utils.getTimer;
    import flash.events.*;
    import flash.utils.getTimer;
    import flash.display.DisplayObject;
    import flash.display.Graphics;
    import flash.events.TimerEvent;
    
    


    




    public class Dodge extends MovieClip
    {
        private var mcBob:Bob;
        private var mcStartButton:StartButton;


        static const mcBobDX = 200;
        //stride var
        private var makeStride:uint = 1;
        //used to move char
        private var leftArrow:Boolean = false;
        private var rightArrow:Boolean = false;
        private var upArrow:Boolean = false;
        private var bottomArrow:Boolean = false;
        
        


        public var lastTime:int;


        private var mcBobX:Number = 263;
        private var mcBobY:Number = 199;
        private var myTimer:Timer = new Timer(1000,0);
        myTimer.addEventListener(TimerEvent.TIMER, differentStrides);
        myTimer.start();










        public function Dodge()
        {
            mcStartButton = new StartButton  ;
            mcStartButton.x = 152;
            mcStartButton.y = 164;
            MovieClip(mcStartButton).gotoAndStop(1);
            addChild(mcStartButton);
            mcStartButton.addEventListener(MouseEvent.CLICK, startGame);




        }
        //start game
        public function startGame(event:MouseEvent):void
        {
            //deleting and switching
            removeChild(mcStartButton);
            mcStartButton.removeEventListener(MouseEvent.CLICK, startGame);
            mcBob = new Bob();
            mcBob.gotoAndStop(2);
            mcBob.x = mcBobX;
            mcBob.y = mcBobY;
            addChild(mcBob);
            stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDown);
            stage.addEventListener(KeyboardEvent.KEY_UP, keyUp);
            addEventListener(Event.ENTER_FRAME, bobAnimation);
            lastTime = getTimer();
        }
        //Animation
        private function bobAnimation(event:Event):void
        {


            var timePassed:int = getTimer() - lastTime;
            lastTime +=  timePassed;
            //check boundries////////////
            ////////////////////////////////////
            if (leftArrow == true)
            {


                if (mcBob.x < 18)
                {
                    leftArrow = false;
                    mcBob.x = 23;
                }
            }
            if (rightArrow == true)
            {
                if (mcBob.x > 530)
                {
                    rightArrow = false;
                    mcBob.x = 530;


                }
            }
            if (upArrow == true)
            {
                if (mcBob.y < 15)
                {
                    upArrow = false;
                    mcBob.y = 13;
                }
            }
            if (bottomArrow == true)
            {
                if (mcBob.y > 381)
                {
                    bottomArrow = false;
                    mcBob.y = 381;
                }
            }






            ///move object
            if (leftArrow == true)
            {
                mcBobX += (mcBobDX*timePassed/1000)*-1;




            }
            if (rightArrow == true)
            {
                mcBobX += (mcBobDX*timePassed/1000);






            }


            if (upArrow == true)
            {
                mcBobY += (mcBobDX*timePassed/1000)*-1;




            }
            if (bottomArrow == true)
            {
                mcBobY += (mcBobDX*timePassed/1000);




            }


            mcBob.x = mcBobX;
            mcBob.y = mcBobY;


            /////rotate char
            if (upArrow == true)
            {
                mcBob.rotation = 0;
            }
            if (bottomArrow == true)
            {
                mcBob.rotation = 180;
            }






            if (leftArrow == true)
            {
                if (upArrow == true)
                {
                    mcBob.rotation = 315;
                }
                else if (bottomArrow == true)
                {
                    mcBob.rotation = 225;
                }
                else
                {
                    mcBob.rotation = 270;
                }
            }
            if (rightArrow == true)
            {
                if (upArrow == true)
                {
                    mcBob.rotation = 45;
                }
                else if (bottomArrow == true)
                {
                    mcBob.rotation = 135;
                }
                else
                {
                    mcBob.rotation = 90;
                }
            }


















        }






    






    function differentStrides(e:TimerEvent):void
    {
        if (leftArrow == true || rightArrow == true || upArrow == true || bottomArrow == true)
        {


            makeStride++;


            /*if (makeStride == 3)
            {
            makeStride = 1;
            }*/


            mcBob.gotoAndStop(makeStride);
            trace(makeStride);
        }
    }








        function keyDown(event:KeyboardEvent):void
        {
            if (event.keyCode == 37)
            {
                leftArrow = true;








            }
            else if (event.keyCode == 39)
            {
                rightArrow = true;


            }
            else if (event.keyCode == 38)
            {
                upArrow = true;


            }
            else if (event.keyCode == 40)
            {
                bottomArrow = true;


            }
        }








        function keyUp(event:KeyboardEvent):void
        {
            if (event.keyCode == 37)
            {
                leftArrow = false;




            }
            else if (event.keyCode == 39)
            {
                rightArrow = false;
            }
            else if (event.keyCode == 38)
            {
                upArrow = false;
            }
            else if (event.keyCode == 40)
            {
                bottomArrow = false;
            }
        }








    }




}

This is me trying to create a timer :stuck_out_tongue:


private var myTimer:Timer = new Timer(1000,0);
myTimer.addEventListener(TimerEvent.TIMER, differentStrides);
myTimer.start();