Can't call play() when i load SWF file with Loader

[djflame]

So … my code:

var req:URLRequest = new URLRequest(“some.swf”);
var loader:Loader = new Loader();
loader.name = “loader”;
loader.load(req);

stage.addChild(loader);
loader.play(); (i try loader.content.play() but … error)

Please HELP ME