Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Event' not found in C:\Landaweb\webs\serverarcos\vendor\symfony\event-dispatcher\LegacyEventProxy.php:20 Stack trace: #0 {main} thrown in C:\Landaweb\webs\serverarcos\vendor\symfony\event-dispatcher\LegacyEventProxy.php on line 20