Fatal error: Uncaught Error: Class 'OCP\AppFramework\Controller' not found in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/files_pdfviewer/lib/Controller/DisplayController.php:22 Stack trace: #0 {main} thrown in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/files_pdfviewer/lib/Controller/DisplayController.php on line 22