Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Event' not found in /home/eberhardschwarze/public_html/vendor/contao-bootstrap/core/src/Message/Command/BuildContextConfig.php:28 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/contao-bootstrap/core/src/Message/Command/BuildContextConfig.php on line 28