Fatal error: Uncaught Error: Interface "TYPO3\CMS\Core\Mail\MailerInterface" not found in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-core/Classes/Mail/Mailer.php:41 Stack trace: #0 {main} thrown in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-core/Classes/Mail/Mailer.php on line 41