Fatal error: Uncaught Error: Class "Rapidmail\ApiClient\Client" not found in /www/htdocs/w01de4e9/meinlebenshop.de/app/Model/Newsletter.php:37 Stack trace: #0 /www/htdocs/w01de4e9/meinlebenshop.de/app/Controller/AccountController.php(46): Owa\Model\Newsletter->__construct() #1 /www/htdocs/w01de4e9/meinlebenshop.de/app/Core/Application.php(150): Owa\Controller\AccountController->__construct() #2 /www/htdocs/w01de4e9/meinlebenshop.de/public/index.php(45): Owa\Core\Application->__construct() #3 {main} thrown in /www/htdocs/w01de4e9/meinlebenshop.de/app/Model/Newsletter.php on line 37