J’aimerai installer SlimStatle pour gérer le trafic web de mon site perso chez FREE,

J’ai bien renommé config.php

/** Database connection */
var $db_server = ‘sql.free.fr ‘; // Leave as localhost unless you know otherwise
var $db_username = ‘LOG’; // The username used to access your database
var $db_password = ‘MDP_DU COMPTE’; // The password used to access your database
var $db_database = ‘slimstat’; // The database containing SlimStat’s tables

/** Username/password required to login to SlimStat */
var $slimstat_use_auth = true;
var $slimstat_username = ‘LOG’;
var $slimstat_password = ‘MDP’;

quand j’ouvre mon site :

http://monsite.free.fr/slimstat/

j’ai le message d’erreur :

Fatal error: Call to undefined function: mb_strlen() in /mnt/111/free.fr/8/3/clyver/slimstat/_lib/config.php on line 131

Merci