1120: Access of undefined property p1.

here is the code I used :

import flash.events.MouseEvent;

stop();

var p1StartX: int = 56
var p1StartY: int = 112
var p1EndX: int = 368.15
var p1EndY: int = 162.05

p1.buttonMode = true;
p1.addEventListener(MouseEvent.MOUSE_DOWN,startDragging);
p1.addEventListener(MouseEvent.MOUSE_DOWN,startDragging);

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

{e.currentTarget.stopDrag();}

and compiling this I get error:

play, Layer 'Actions', Frame 2, Line 10, Column 1 1120: Access of undefined property p1.
play, Layer 'Actions', Frame 2, Line 11, Column 1 1120: Access of undefined property p1.
play, Layer 'Actions', Frame 2, Line 12, Column 1 1120: Access of undefined property p1.

Guess instance name is alright.It would be very nice if anyone can help me out.