Fatal error: Uncaught Error: Interface 'Symfony\Contracts\EventDispatcher\EventDispatcherInterface' not found in /var/www/html/btest1.ledaco.net/public_html/external/vendor/symfony/event-dispatcher/EventDispatcherInterface.php:23 Stack trace: #0 {main} thrown in /var/www/html/btest1.ledaco.net/public_html/external/vendor/symfony/event-dispatcher/EventDispatcherInterface.php on line 23