Fatal error: Uncaught Error: Interface "Symfony\Component\Config\Definition\ConfigurationInterface" not found in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\swiftmailer-bundle\DependencyInjection\Configuration.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\swiftmailer-bundle\DependencyInjection\Configuration.php on line 26