Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DataCollector\DataCollector" not found in /srv/www/sites/public/starter-cms/vendor/symfony/mailer/DataCollector/MessageDataCollector.php:23 Stack trace: #0 {main} thrown in /srv/www/sites/public/starter-cms/vendor/symfony/mailer/DataCollector/MessageDataCollector.php on line 23