Fatal error: Uncaught Error: Class "OCP\UserMigration\UserMigrationException" not found in /var/www/html/nextcloud/apps/settings/lib/UserMigration/AccountMigratorException.php:14 Stack trace: #0 {main} thrown in /var/www/html/nextcloud/apps/settings/lib/UserMigration/AccountMigratorException.php on line 14