AS3 Help needed

I am in the process of creating a package selector for a website. However, I continue to get errors. Please advise.

stop();
enter_btn.addEventListener(MouseEvent.CLICK, clickHandler);
yes1_btn.addEventListener(MouseEvent.CLICK, clickHandler);
no1_btn.addEventListener(MouseEvent.CLICK, clickHandler);
back1_btn.addEventListener(MouseEvent.CLICK, clickHandler);
next1_btn.addEventListener(MouseEvent.CLICK, clickHandler);
yes2_btn.addEventListener(MouseEvent.CLICK, clickHandler);
no2_btn.addEventListener(MouseEvent.CLICK, clickHandler);
back2_btn.addEventListener(MouseEvent.CLICK, clickHandler);
next2_btn.addEventListener(MouseEvent.CLICK, clickHandler);
yes3_btn.addEventListener(MouseEvent.CLICK, clickHandler);
no3_btn.addEventListener(MouseEvent.CLICK, clickHandler);
back3_btn.addEventListener(MouseEvent.CLICK, clickHandler);
next3_btn.addEventListener(MouseEvent.CLICK, clickHandler);
yes4_btn.addEventListener(MouseEvent.CLICK, clickHandler);
no4_btn.addEventListener(MouseEvent.CLICK, clickHandler);

function clickHandler(event:MouseEvent):void {
    switch (event.currentTarget.label)
    {
        case "ENTER" :
            gotoAndStop(5);
            break;
        case "YES1" :
            gotoAndStop(6);
            break;
        case "NO1" :
            gotoAndStop(7);
            break;
        case "BACK1" :
            gotoAndStop(5);
            break;
        case "NEXT1" :
            gotoAndStop(10);
            break;
        case "YES2" :
            gotoAndStop(11);
            break;
        case "NO2" :
            gotoAndStop(12);
            break;
        case "BACK2" :
            gotoAndStop(10);
            break;
        case "NEXT2" :
            gotoAndStop(15);
            break;
        case "YES3" :
            gotoAndStop(16);
            break;
        case "NO3" :
            gotoAndStop(17);
            break;
        case "YES4" :
            gotoAndStop(18);
            break;
        case "NO4" :
            gotoAndStop(19);
            break;
        case "BACK3" :
            gotoAndStop(15);
            break;
        case "NEXT3" :
            gotoAndStop(20);
            break;
    }
}


logo_mc.addEventListener(MouseEvent.CLICK, onClick);
function onClick(event:MouseEvent):void
{
    trace("click!!!!");
    event.target.y -= 3;
    event.target.rotation += 3;
} 

logo_mc.buttonMode = true;