Fatal error: Uncaught Error: Interface "ILIAS\FileUpload\Processor\PreProcessor" not found in /var/www/html/ilias/components/ILIAS/File/classes/PreProcessors/class.ilCountPDFPagesPreProcessors.php:30 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/File/classes/PreProcessors/class.ilCountPDFPagesPreProcessors.php on line 30