DisplayObject error, Help!

programming flash
1

I am loading multiple swf files and I get an error.
All files do load.
Error #2025: The supplied DisplayObject must be a child of the caller

Below is a snippet of my code.
Any help or advice would be greatly appreciated.
This is driving me insane, please help.

CODE BELOW

var myRequest38:URLRequest = new URLRequest(“sisil_website.swf”);
sisilWebsite_btn.addEventListener(MouseEvent.MOUSE _UP, loadb38);
function loadb38(event:MouseEvent):void {
myloader.load(myRequest38);
stage.addChild(myloader);
myloader.x=300;
myloader.y=145;
myloader.scaleX=1;
myloader.scaleY=1;
}

var myRequest39:URLRequest = new URLRequest(“mbanners.swf”);
microsoft_btn.addEventListener(MouseEvent.MOUSE_UP , loadm39);
function loadm39(event:MouseEvent):void {
myloader.load(myRequest39);
stage.addChild(myloader);
myloader.x=350;
myloader.y=145;
myloader.scaleX=1;
myloader.scaleY=1;
}