Fatal error: Uncaught Error: Interface "ilSkillLevelRepository" not found in /var/www/html/ilias/components/ILIAS/Skill/Level/class.ilSkillLevelDBRepository.php:25 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Skill/Level/class.ilSkillLevelDBRepository.php on line 25