Fatal error: Uncaught Error: Interface "ilCertificatePlaceholderDescription" not found in /var/www/html/ilias/components/ILIAS/Test/src/Certificate/TestPlaceholderDescription.php:26 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Test/src/Certificate/TestPlaceholderDescription.php on line 26