Fatal error: Uncaught Error: Class 'OCP\Util' not found in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/files_pdfviewer/appinfo/app.php:15 Stack trace: #0 {main} thrown in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/files_pdfviewer/appinfo/app.php on line 15