Fatal error: Uncaught Error: Class "Symfony\Component\EventDispatcher\EventDispatcher" not found in /var/www/erp/spreadsheet/vendor/symfony/event-dispatcher/ContainerAwareEventDispatcher.php:24 Stack trace: #0 {main} thrown in /var/www/erp/spreadsheet/vendor/symfony/event-dispatcher/ContainerAwareEventDispatcher.php on line 24