Error #1034 when importing an external swf

1

Hi

I have externally loaded a swf and I get this message:

Error #1034: Type Coercion failed: cannot convert flash.display::MovieClip@1cb847e1 to flash.display.Loader.

Here is the as i have used:

var imageRequest:URLRequest = new URLRequest("bg.swf"); 
var theClip_mc:Loader = new Loader(); 
theClip_mc.load(imageRequest); 
addChild(theClip_mc);

Any ideas how it can be rectified?
Thanks
J_Mo