Fatal error: Uncaught Error: Interface "ilBuddySystemRelationState" not found in /var/www/html/ilias/components/ILIAS/Contact/BuddySystem/classes/states/class.ilAbstractBuddySystemRelationState.php:25 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Contact/BuddySystem/classes/states/class.ilAbstractBuddySystemRelationState.php on line 25