Fatal error: Uncaught Error: Interface "ilCertificatePlaceholderValues" not found in /var/www/html/ilias/components/ILIAS/Course/classes/Certificate/CoursePlaceholderValues.php:42 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Course/classes/Certificate/CoursePlaceholderValues.php on line 42