Trying to add metadata to a live stream completely fails

Question

Hi.  I've been following this document http://help.adobe.com/en_US/flashmediaserver/devguide/WS5b3ccc516d4fbf351e63e3d11a0773d56e -7ff6Dev.html for adding metadata to an FMS live stream from a Flash widget.
I've created a stripped-down version of the code (listed below); the same as the original code except the controls are removed.  It works fine only if I comment out the ns.send calls.  If I leave in the ns.send calls, no clients are ever able to view anything.  I'm using a stock FMS 4.5 install on Amazon EC2 -- the AMI is ami-904f08c2.  And I'm compiling the swf using Flex SDK 4.6 on Linux with the command "mxmlc -compiler.library-path+=./playerglobal11_0.swc -swf-version=13 -static-link-runtime-shared-libraries Broadcaster.as".
package {
    import flash.display.MovieClip;
    import flash.net.NetConnection;
    import flash.events.NetStatusEvent; 
    import flash.events.MouseEvent;
    import flash.events.AsyncErrorEvent;
    import flash.net.NetStream;
    import flash.media.Video;
    import flash.media.Camera;
    import flash.media.Microphone;
    public class Broadcaster extends MovieClip {
        private var nc:NetConnection;
        private var ns:NetStream;
        private var nsPlayer:NetStream;
        private var vid:Video;
        private var vidPlayer:Video;
        private var cam:Camera;
        private var mic:Microphone;
        private var myMetadata:Object;
        public function Broadcaster(){
            setupUI();
            nc = new NetConnection();
            nc.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);
            nc.connect("rtmp://myserver/live");
         *  Clear the MetaData associated with the stream
        private function clearHandler(event:MouseEvent):void {
            if (ns){
                trace("Clearing MetaData");
                ns.send("@clearDataFrame", "onMetaData");
        private function startHandler(event:MouseEvent):void {
            displayPlaybackVideo();
        private function onNetStatus(event:NetStatusEvent):void {
            trace(event.target + ": " + event.info.code);
            switch (event.info.code)
                case "NetConnection.Connect.Success":
                    publishCamera();
                    displayPublishingVideo();
                    break;
                case "NetStream.Publish.Start":
                    sendMetadata();
                    break;
        private function asyncErrorHandler(event:AsyncErrorEvent):void {
            trace(event.text);
        private function sendMetadata():void {
            trace("sendMetaData() called")
            myMetadata = new Object();
            myMetadata.customProp = "Welcome to the Live feed of YOUR LIFE, already in progress.";
            ns.send("@setDataFrame", "onMetaData", myMetadata);
        private function publishCamera():void {
            cam = Camera.getCamera();
            mic = Microphone.getMicrophone();
            ns = new NetStream(nc);
            ns.client = this;
            ns.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);
            ns.addEventListener(AsyncErrorEvent.ASYNC_ERROR, asyncErrorHandler);
            ns.attachCamera(cam);
            ns.attachAudio(mic);
            ns.publish("livestream", "live");
        private function displayPublishingVideo():void {
            vid = new Video(cam.width, cam.height);
            vid.x = 10;
            vid.y = 10;
            vid.attachCamera(cam);
            addChild(vid); 
        private function displayPlaybackVideo():void {
            nsPlayer = new NetStream(nc);
            nsPlayer.client = this;
            nsPlayer.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);
            nsPlayer.addEventListener(AsyncErrorEvent.ASYNC_ERROR, asyncErrorHandler);
            nsPlayer.play("myCamera", 0);
            vidPlayer = new Video(cam.width, cam.height);
            vidPlayer.x = cam.width + 100;
            vidPlayer.y = 10;
            vidPlayer.attachNetStream(nsPlayer);
            addChild(vidPlayer);
        private function setupUI():void {
        public function onMetaData(info:Object):void {

Answer 1

Also, emitting other events in the ns.send calls works; eg. if I do ns.send("blah", "onMetaData", myMetadata), nothing happens (because there's no "blah" function to do anything), but at least this doesn't cause the entire stream to fail.