"Un término no está definido y no tiene propiedades" error de

stage.addEventListener(Event.ENTER_FRAME,enter_frame_func);

function enter_frame_func(e:Event):void{
    var picItems:Array = new Array(square1, square2, square3, square4, square5);
    for (var i = 0; 1 < picItems.length; i++) {
        var xxm:Number = picItems[i].mouseX;
        var yym:Number = picItems[i].mouseY;
        var dist:Number = Math.sqrt(xxm*xxm + yym*yym);
        if(dist<50){
            picItems[i].scaleX = picItems[i].scaleY = ((200-dist)-picItems[i].scaleY)/80;
            trace(picItems[i].scaleX);
        } else {
            picItems[i].scaleX = picItems[i].scaleY = 1;
        }
    }
}