Fatal error: Uncaught Error: Class "App\Engine\LegacyHandler\LegacyHandler" not found in /var/www/crm_killing_ninja/core/modules/EmailMarketing/Service/Fields/UpdateEmailTemplateBody.php:13 Stack trace: #0 {main} thrown in /var/www/crm_killing_ninja/core/modules/EmailMarketing/Service/Fields/UpdateEmailTemplateBody.php on line 13