Fatal error: Uncaught Error: Interface "App\ViewDefinitions\LegacyHandler\ViewDefinitionMapperInterface" not found in /var/www/crm_killing_ninja/core/backend/ViewDefinitions/LegacyHandler/SubpanelButtonTraverser.php:38 Stack trace: #0 {main} thrown in /var/www/crm_killing_ninja/core/backend/ViewDefinitions/LegacyHandler/SubpanelButtonTraverser.php on line 38