Netstream.record.noaccess?

I've just finished installing FMS 4.0. What I would like to do is publish my camera's feed to to a custom app I am writing and have it saved to a file. Here is a portion of my code:

            cam = Camera.getCamera();
            cam.setQuality(0, 100);
            cam.setMode(520, 440, 24, true);
            mic = Microphone.getMicrophone();
            ns = new NetStream(nc);
            ns.attachCamera(cam);
            ns.attachAudio(mic);
            ns.publish("myCamera", "record");

I get the following response from the server:

NetStream.Record.NoAccess

I have JUST installed this server, so I may be missing something. Can someone please give me some pointers? Thank you very much!