Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Event' not found in /home/eberhardschwarze/public_html/vendor/netzmacht/contao-form-designer/src/Event/SelectLayoutEvent.php:26 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/netzmacht/contao-form-designer/src/Event/SelectLayoutEvent.php on line 26