Fatal error: Uncaught Error: Interface 'Psr\EventDispatcher\EventDispatcherInterface' not found in C:\xampp\htdocs\admin\vendor\symfony\event-dispatcher-contracts\EventDispatcherInterface.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\symfony\event-dispatcher-contracts\EventDispatcherInterface.php on line 19