Fatal error: Uncaught Error: Interface 'Symfony\Component\EventDispatcher\EventDispatcherInterface' not found in /var/www/typo3/vendor/symfony/event-dispatcher/ImmutableEventDispatcher.php:19
Stack trace:
#0 {main}
thrown in /var/www/typo3/vendor/symfony/event-dispatcher/ImmutableEventDispatcher.php on line 19