Fatal error: Uncaught Error: Class "App\Data\LegacyHandler\ListDataHandler" not found in /var/www/html/core/backend/Data/LegacyHandler/PresetDataHandlers/AlertsDataHandler.php:35 Stack trace: #0 {main} thrown in /var/www/html/core/backend/Data/LegacyHandler/PresetDataHandlers/AlertsDataHandler.php on line 35