Express node.js error: unknown filter ":javascript"

I am following the documentation from here: https://github.com/Instagram/Realtime-Demo

Successfully installed all the libraries, however got this error on localhost unknown filter ":javascript"

The attached screenshot URL is the output when I hit the localhost in browser.

Any one has similar experience? How to fix? Very much appreciate!

screenshot: http://cl.ly/image/2N1M2f1p240n

The demo is quite old, the :javascript filter doesn't exist anymore.

Replace this: 

:javascript
  | socket.connect();
  | $(document).ready(Media.positionAll);

With this:

script
  socket.connect();
  $(document).ready(Media.positionAll);

(although I can't guarantee that you won't run into any other problems)