Fatal error: Uncaught Error: Class 'Symfony\Contracts\EventDispatcher\Event' not found in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Event/RobotsTxtEvent.php:20
Stack trace:
#0 {main}
thrown in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Event/RobotsTxtEvent.php on line 20