problem with very basic Twitter datasource example from CakePHP book

Hi,

Yes. I am a newbie. Working with CakePHP is a joy! But I am running into a little problem. I've implemented the Twitter datasource example from the CakePHP book (http://book.cakephp.org/1.3/en/The-Manual/Developing-with-CakePHP/DataSources.html#an-example). No typos or omissions, but I get an error: 

Error: Call to a member function find() on a non-object
File: /Users/xxxx/Sites/app/Controller/CommentsController.php
Line: 30

On line 30: $tweets = $this->Tweet->find('all');

Can anybody shine a light on this? Thanks in advance!!!

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