Error message

• Notice: Undefined variable: app_root in include_once() (line 698 of /var/www/atelier1/sites/default/settings.php).
• Notice: Undefined variable: site_path in include_once() (line 698 of /var/www/atelier1/sites/default/settings.php).
• Notice: Undefined variable: app_root in include_once() (line 817 of /var/www/atelier1/sites/default/settings.php).
• Notice: Undefined variable: site_path in include_once() (line 817 of /var/www/atelier1/sites/default/settings.php).
• Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters in drupal_get_feeds() (line 394 of /var/www/atelier1/includes/common.inc).