'TypeError: undefined is not a function' error when using 'flickrnode' API

I'm new to Node.js and I'm trying to get a Flickr API working on my local machine: https://github.com/ciaranj/flickrnode I have installed the flickr module with npm install flickr.

The simplest call is:

var FlickrAPI= require('flickr').FlickrAPI;
var sys= require('sys');
var flickr= new FlickrAPI(your_api_key_here);

// Search for photos with a tag of 'badgers'
flickr.photos.search({tags:'badgers'},  function(error, results) {
    sys.puts(sys.inspect(results));
});

I've changed 'sys' to 'util' as node prompted me to and added my api key so I'm calling:

var FlickrAPI= require('flickr').FlickrAPI;
var sys= require('util');
var flickr= new FlickrAPI('...');

// Search for photos with a tag of 'badgers'
flickr.photos.search({tags:'badgers'},  function(error, results) {
    sys.puts(sys.inspect(results));
});

Running node myfile.js, I get:

var flickr= new FlickrAPI('a513719086ba8c3a28d2c7726939b58e');
            ^
TypeError: undefined is not a function
    at Object.<anonymous> (/home/charm/ciaranj-flickrnode-8a9d85f/lib/simple.js:3:13)
    at Module._compile (module.js:446:26)
    at Object..js (module.js:464:10)
    at Module.load (module.js:353:31)
    at Function._load (module.js:311:12)
    at Array.0 (module.js:484:10)
    at EventEmitter._tickCallback (node.js:190:38)

Does anyone know how I overcome this problem?

Thanks!