Multicast video share

I am trying to built a multicast sample of video broadcast. with the trial version of AMS on my local system.

package {

    import flash.display.MovieClip;

    import flash.net.NetConnection;

    import flash.events.NetStatusEvent;

    import flash.net.NetStream;

    import flash.media.Video;

    import flash.media.Camera;

    import flash.media.Microphone;

    import flash.net.NetStreamPlayOptions;

    import flash.net.NetStreamPlayTransitions;

    import flash.net.GroupSpecifier;

    import flash.net.NetGroup;

    public class multicast extends MovieClip

    {

        var nc:NetConnection;

        var ns:NetStream;

        var vid:Video;

        var vidPlayer:Video;

        private var group:NetGroup;

        public var devkey:String = "e4a84a9a6d0d3ce822fa4610-f148941b683a";

        public function multicast()

        {

            nc = new NetConnection();

            nc.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);

            nc.connect("rtmfp://192.168.1.167/multicast");

            nc.client = {onBWDone:function():void{}};

        }

        private function onNetStatus(event:NetStatusEvent):void{

            switch(event.info.code)

            {

                case "NetConnection.Connect.Success":

                    setupGroup();

                    break;

                case "NetGroup.Connect.Success":

                    trace("Group has been generated");

                    break;

                case "NetGroup.Posting.Notify":

                    break;

            }

        }

        private function setupGroup():void

        {

            var groupspec:GroupSpecifier = new GroupSpecifier("myGroup");

            groupspec.postingEnabled = true;

            groupspec.ipMulticastMemberUpdatesEnabled = true;

            groupspec.addIPMulticastAddress("192.168.1.167:30000");

            ns = new NetStream(nc, groupspec.groupspecWithAuthorizations());   

            ns.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);

            var cami:Camera = Camera.getCamera();

            ns.attachCamera(cami);

            ns.publish("multicast");

            vid = new Video(cami.width, cami.height);

            vid.x = 0;

            vid.y = 0;

            vid.attachCamera(cami);

            addChild(vid);

        }

    }

}

Following is the error I am facing:

Error: Error #2154: The NetStream Object is invalid.  This may be due to a failed NetConnection.

    at flash.net::NetStream/invoke()

    at flash.net::NetStream/attachCamera()

    at multicast/setupGroup()

    at multicast/onNetStatus()

Is there some problem with the server url. Please suggest.