[TYPO3] realurl: name instead of id is not working

[Vandemaele David]

When I insert the following code into 
$TYPO3_CONF_VARS['EXTCONF']['realurl']['_DEFAULT']

	'pagePath' => array(
         'type' => 'user',
         'userFunc' => 
'EXT:realurl/class.tx_realurl_advanced.php:&tx_realurl_advanced->main',
         'spaceCharacter' => '-',
         'languageGetVar' => 'L',
         'expireDays' => 3
     ),

and i look at one of the pagelinks, it still shows domain.be/29/ instead 
of domain.be/about_us/

So when I click one of the links, I get : "Error. Reason: "29/" could 
not be found, closest page matching is"

I'm obviously missing something...

David