Fatal error: Uncaught Error: Interface "ILIAS\Setup\Migration" not found in /var/www/html/ilias/components/ILIAS/Exercise/classes/Setup/class.ilExerciseInstructionFilesMigration.php:31 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Exercise/classes/Setup/class.ilExerciseInstructionFilesMigration.php on line 31