Fatal error: Uncaught Error: Interface "Bitrix\MessageService\Providers\DemoManager" not found in D:\ktt\ttepla.com\public_html\bitrix\modules\messageservice\lib\Providers\Base\DemoManager.php:8 Stack trace: #0 {main} thrown in D:\ktt\ttepla.com\public_html\bitrix\modules\messageservice\lib\Providers\Base\DemoManager.php on line 8