Upgrading NodeJS App

I hope this is not too much to ask.

Im new to this NodeJS tech, which I think is amazing, but Im not a really good programmer, I found this awesome example http://softwareas.com/video-sync-with-websocket-and-node/, but I cant make it work. I believe the code its outdated, and Im running the latest Node, I've been trying to fix it but I cant get near close. I dont fully understand how websockets work, and is giving me a headache.

When I run the server it runs just fine.

var sys = require("util");
var ws = require('websocket-server');
var userCount = [];

var server = ws.createServer({
  debug: true
});

server.addListener("connection", function(conn){
  server.broadcast("userCount " + ++userCount);
  conn.addListener("message", function(message){
    server.broadcast(message);
  });
});

server.addListener("close", function(conn){
  server.broadcast("userCount " + --userCount);
});

server.listen(8000, "localhost");
function log(msg) {
  sys.puts(+new Date + ' - ' + msg.toString());
};

But when I interact with the client (Log as a user) the server crashes and I get this error in the console, and I've no idea what it means. http://i.stack.imgur.com/cLlga.png I'm really new to this, and I don't understand D:, any help is really appreciated