MRBS

Hi I made an MRBS installation with drupal integration. Everything works untill I change the $auth["session"] = "php"; and $auth["type"] = "config"; to $auth["session"] = "drupal"; $auth["type"] = "drupal"; in config.inc.php . It shows this: "Fatal error: require_once() [function.require]: Failed opening required 'style.inc' (include_path='.;C:\php5\pear') in C:\Program Files\wamp\www\sites\dummy\mrbs\Themes\default\header.inc on line 49"
Any help please?