1119: Access of possibly undefined property myLoader

Here’s the code where I keep getting the error. This is being written with the mc that handles button function. It worked before I added this.parent myLoader… - Thanks

stop();
function buttonClick(event:MouseEvent):void
{
gotoAndStop(event.target.name);

home.enabled = true;
services.enabled = true;
projects.enabled = true;
links.enabled = true;
contact.enabled = true;

event.target.enabled = false;
this.parent.myLoader.load(new URLRequest(event.target.name + ".swf"));

}
home.addEventListener(MouseEvent.CLICK, buttonClick);
services.addEventListener(MouseEvent.CLICK, buttonClick);
projects.addEventListener(MouseEvent.CLICK, buttonClick);
links.addEventListener(MouseEvent.CLICK, buttonClick);
contact.addEventListener(MouseEvent.CLICK, buttonClick);