Fatal error: Uncaught Error: Interface "Psr\EventDispatcher\EventDispatcherInterface" not found in /var/www/html/app/vendor/symfony/event-dispatcher-contracts/EventDispatcherInterface.php:19
Stack trace:
#0 {main}
thrown in /var/www/html/app/vendor/symfony/event-dispatcher-contracts/EventDispatcherInterface.php on line 19