Error while loading an child movieclip if the child has any action script

Question

Hi
I am developing an application where I need to load a child.swf . All works fine when I load the mc but as soon as I add Action Script (lets say trace("test")) to the Child.swf I get a Error #1009: Cannot access a property or method of a null object reference. On the addChild line.
Code
trace("Toothpaste click");
var mLoader:Loader = new Loader();
var mRequest:URLRequest = new URLRequest("Child);
mLoader.load(mRequest);
mcContainer.addChild(mLoader);

Answer 1

Sorry.Thanks
Typo on the forum.
I can load the child.swf see the image/text in the child  displayed in the parent but as soon as I add as3 to the child page I receive the above mentioned error. If I run the child.swf from the IDE or by itself everything works fine .
trace("Toothpaste click");
var mLoader:Loader = new Loader();
var mRequest:URLRequest = new URLRequest("Child.swf");
mLoader.load(mRequest);
mcContainer.addChild(mLoader);