1120: Access of undefined property p01.

Here is the code I used:

import flash.events.MouseEvent;

stop();

var p01StartX: int = 56
var p01StartY: int = 112
var p01EndX: int = 368.15
var p01EndY: int = 162.05

p01.buttonMode = true;

function startDragging(e:MouseEvent):void
{
e.currentTarget.startDrag();
}
function stopDragging(e:MouseEvent):void {
e.currentTarget.stopDrag();
}

and thus I get the error stated as subject.Any suggestion please?