Add socket.io to basic_example throw error

[caok]

There has been some problem when i add socket.io to basic_example.

events.js:72
        throw er; // Unhandled 'error' event
              ^
TypeError: Cannot read property 'key' of null

And i add these code:

var socket = require("socket.io");

....................

io = socket.listen(server);
io.sockets.on('connection', function(client) {
  console.log('Client connected...');
}) 

[jcague]

I can't figure out where exactly the problem is on your app since it's not directly related to Licode. Maybe the version of socket.io?

[caok]

Is that possible that:
since erizocontroller already have a socket.io, so I can not call another socket.io again in basicserver.js?