Plugin Question: Socket.io (FIXED)

Do I have to work with strings?

I need to send a Variable, and sending X as a message, sends X as a message not as the Variable X data.

So I tried to change it a bit:

<img src="http://imageshack.us/a/img16/1664/clientside.png" border="0" />

And Serverside:

var entities = [], count = 0;

var io = require("socket.io").listen(80);

var x = 50;

function sendPos()

{

    io.sockets.emit("message", x);

}

setInterval(sendPos, 1000);

But then I get this Error:

<img src="http://imageshack.us/a/img26/9178/localhosterror.png" border="0" />

Fixed.

io.sockets.emit("message", 'Pos,' + x);