Help With TypeError: Error #1009

I know what TypeError: Error #1009 is, but I can't seem to figure out what exactly the problem is with my code.

My Code:

MoreWhite.addEventListener(MouseEvent.CLICK, fl_ClickToGoToAndPlayFromFrame_53);

function fl_ClickToGoToAndPlayFromFrame_53(event:MouseEvent):void

{

    fl_TimerInstance_27.stop();

    gotoAndPlay(82, "Scene 15");

    GreenCircleWhite.visible = true;

    MoreWhite.removeEventListener(MouseEvent.CLICK, fl_ClickToGoToAndPlayFromFrame_53); <----------------------- This line is where the error occurs when I run the program.

    MoreBlack.removeEventListener(MouseEvent.CLICK, fl_ClickToGoToAndPlayFromFrame_54);

    this.stop();

    var fl_SecondsToCountDown_5:Number = 2;

    var fl_CountDownTimerInstance_5:Timer = new Timer(1000, fl_SecondsToCountDown_5);

    fl_CountDownTimerInstance_5.addEventListener(TimerEvent.TIMER, fl_CountDownTimerHandler_5);

    fl_CountDownTimerInstance_5.start();

    function fl_CountDownTimerHandler_5(event:TimerEvent):void

    {

        trace(fl_SecondsToCountDown_5 + " seconds");

        fl_SecondsToCountDown_5--;

        if(fl_SecondsToCountDown_5 == 0)

        {

            BlueCircleBlack.visible = true;

            trace("Trial Number: 7" + "\nTrial Type: Disagreement" + "\nInitial Choice: 0");

            gotoAndPlay(82, "Scene 15");

        }

    }

}

This code is just a duplicate of another code that are on different scenes.

All my scenes have the same code, but with different numbers added onto each variable to make it different.

All those other scenes work just fine, but it's this particular set of code that doesn't work at all.

Any ideas on what the problem is? I'll provide extra information if it helps coming up with a solution.