Error #1010 help

[mastermc01]

i am following this tuturial, but when i go to debug i get this error.

TypeError: Error #1010: A term is undefined and has no properties.
	at Index_fla::MainTimeline/frame1()[Index_fla.MainTimeline::frame1:11]

here is the code.

/////////////////////////////////////////////////////////////////////
// Startup.
/////////////////////////////////////////////////////////////////////
stop();
mainMenu_mc.stop();


/////////////////////////////////////////////////////////////////////
// Event Setup.
/////////////////////////////////////////////////////////////////////
mainMenu_mc.goals_btn.addEventListener(MouseEvent.CLICK, navigationClicked);
mainMenu_mc.statements_btn.addEventListener(MouseEvent.CLICK, navigationClicked);
mainMenu_mc.outcomes_btn.addEventListener(MouseEvent.CLICK, navigationClicked);
mainMenu_mc.resume_btn.addEventListener(MouseEvent.CLICK, navigationClicked);
mainMenu_mc.statements_btn.addEventListener(MouseEvent.CLICK, navigationClicked);
/////////////////////////////////////////////////////////////////////
// Event Handlers.
/////////////////////////////////////////////////////////////////////
function navigationClicked(Event:MouseEvent):void
{
    //We'll use this to store the Frame Label's name.
    var frmLabel:String = '';

    //Determine what Frame Label to use based on which
    //button was clicked.
    switch (Event.target)
    {

        case mainMenu_mc.goals_btn :
            frmLabel = "goals_frm";
            break;
        case mainMenu_mc.statements_btn :
            frmLabel = "statement_frm";
            break;
        case mainMenu_mc.outcomes_btn :
            frmLabel = "outcomes_frm";
            break;
        case mainMenu_mc.resume_btn :
            frmLabel = "resume_frm";
            break;
        case mainMenu_mc.letters_btn :
            frmLabel = "letters_frm";
            break;
   }

    //Find the frame number based on our Frame Label.
    var frmGoto:Number = this.getFrame(frmLabel);

    //Go to the requested page.
    gotoAndPlay(frmGoto);
}
/////////////////////////////////////////////////////////////////////
// Helper Functions.
/////////////////////////////////////////////////////////////////////
function getFrame(frameName:String):Number
{
    var frame:Number = 1;

    //Loop through all Frame Labels to find our requested frame.
    for (var i = 0; i < currentLabels.length; i++)
    {
        if (currentLabels[i].name == frameName)
        {
            frame = currentLabels[i].frame;
            break;
        }
    }

    return frame;
}

could some one pls tell me why i am getting this error?
i am using flash cs4, and in action script 3.0 if you need to know that.

[Ziggwies]

Go into "mainMenu_mc" and make sure there is an object named "goals_btn".

[mastermc01]

ya it there

[Ziggwies]

The <Instance Name> isn't filled in. You need to replace that with "goals_btn".

[mastermc01]

Still doesn't work, what else could it be?

i have included the file i really need to find out why it doing this