Fatal error: Uncaught Error: Interface "ILIAS\Skill\Service\SkillServiceInterface" not found in /var/www/html/ilias/components/ILIAS/Skill/Service/classes/class.SkillService.php:32 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Skill/Service/classes/class.SkillService.php on line 32