Fatal error: Uncaught Error: Interface "ilDerivedTaskProvider" not found in /var/www/html/ilias/components/ILIAS/Exercise/Tasks/classes/class.ilExerciseDerivedTaskProvider.php:24 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Exercise/Tasks/classes/class.ilExerciseDerivedTaskProvider.php on line 24