Fatal error: Uncaught Error: Class "OCA\Richdocuments\Db" not found in /users/ms-it/www/oc/apps-external/richdocuments/lib/Db/Wopi.php:20 Stack trace: #0 {main} thrown in /users/ms-it/www/oc/apps-external/richdocuments/lib/Db/Wopi.php on line 20