Fatal error: Uncaught Error: Interface "ilCertificatePlaceholderValues" not found in /var/www/html/ilias/components/ILIAS/Exercise/Certificate/ExercisePlaceholderValues.php:40 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Exercise/Certificate/ExercisePlaceholderValues.php on line 40