AS3: Removing child throws error

Here's what I'm trying to do:
1. Load swf
2. Add children movieclips to swf
3. click one of the children movieclips
4. unload swf and start all over again

However I keep getting the error "The supplied DisplayObject must be a child of the caller". Even when I simplify the code down to this:

function loadSwf(newSwf) {
            swfLoader.load(new URLRequest(newSwf));
              swfLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onSwfLoad);
            
            function onSwfLoad(e:Event) {
                  curSwf = e.target.content;
                  stage.addChild(curSwf););
                  unloadSwf();
            }
}

function unloadSwf() {
      this.removeChild(curSwf);
}


I continue to get the error. What am I doing wrong? Argh!