Fatal error: Uncaught Error: Class "OCP\Collaboration\Reference\ADiscoverableReferenceProvider" not found in /var/www/html/nextcloud/apps/deck/lib/Reference/CardReferenceProvider.php:26 Stack trace: #0 {main} thrown in /var/www/html/nextcloud/apps/deck/lib/Reference/CardReferenceProvider.php on line 26