Gotoandstop question

I am converting an exitisting as2 fla to as3 and this is my first time even looking at as3.

what am i doing wrong on this?

stop();
function eventResponse2(evt:MouseEvent):void {
mc_navBar.gotoAndStop(“profile”);
trace(“clicked”);
}

btn_profile.addEventListener(MouseEvent.MOUSE_UP,eventResponse2);

the trace works i comment out the gotoandstop. here is the error i get…

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at homepage2_fla::MainTimeline/eventResponse2()

Thanks!

Hiren