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