PHP: problème zone admin

Bonjour,
voilà j'ai un problème au niveau de ma zone administrateur :

Warning: main() [function.main]: open_basedir restriction in effect. File(/config/functions.php) is not within the allowed path(s): (/mnt/159/sdc/9/d/nom_de_mon_site) in /mnt/159/sdc/9/d/nom_de_mon_site/membrex/zadmin/config_script.php on line 8

Warning: main(/config/functions.php) [function.main]: failed to open stream: Operation not permitted in /mnt/159/sdc/9/d/nom_de_mon_site/membrex/zadmin/config_script.php on line 8

Fatal error: main() [function.require]: Failed opening required '/config/functions.php' (include_path='/mnt/159/sdc/9/d/nom_de_mon_site/include:.:/usr/php4/lib/php') in /mnt/159/sdc/9/d/nom_de_mon_site/membrex/zadmin/config_script.php on line 8

voici le code de la page : 'config_script.php'


<?php
define("SERVEUR", "sql.free.fr");
define("NAME", "mon_site");
define("PASS", "mot_de_passse");
define("BASE", "mon_site");
define("PREFIXE", "fk_");
define("LANG", "fr");
require_once(".../config/functions.php");
connexion();
require_once("online_compt.php");
require_once("lang/".LANG.".php");
require_once("conf_variables.php");
?>

Voilà merci d'avance !

@+