error message from socket.io and coffeescript
===

I created a coffeescript version from the second example here:

http://socket.io/#how-to-use

In the example an express server is used by socket.io and two messages are passed between client and server.

You can take a look at the coffeescript and its generated javascript on pastebin:

 - [server.coffee][1]
 - [frontend.coffee][2]
 - [server.js][3]
 - [frontend.js][4]

Although I can't spot an error in the code the program crashes. Here's the error message:

 - [error message][5]

Without socket.io the application runs fine. I'm certain that the error has nothing to do with express or jade.
My machine runs with windows 7 32bit. The browser is the latest version of chrome.
  [1]: http://pastebin.com/cdR0Axx4
  [2]: http://pastebin.com/va9qJZJ9
  [3]: http://pastebin.com/6MXLLPJD
  [4]: http://pastebin.com/H2MR3yhG
  [5]: http://pastebin.com/r1ZasEHu