Fatal error: Uncaught Error: Interface "ilCertificateFilename" not found in /var/www/html/ilias/components/ILIAS/ScormAicc/classes/Certificate/class.ilCertificateScormPdfFilename.php:21 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/ScormAicc/classes/Certificate/class.ilCertificateScormPdfFilename.php on line 21