Newbie question - getFeed not working

Hi!

I´m new to Zend Framework (quite new to PHP also :-). I wrote my first piece of code, and it's not working:

require_once 'Zend/Loader.php';

Zend_Loader::loadClass('Zend_Gdata');
Zend_Loader::loadClass('Zend_Gdata_Query');

$gdata = new Zend_Gdata ();
$query = new Zend_Gdata_Query ('http://gdata.youtube.com/feeds/standardfeeds/top_rated');
$feed = $gdata->getFeed($query);

It executes everything but the last line. Any ideas?

Thanx

Adrian