Fatal error: Uncaught Error: Interface 'Symfony\Component\EventDispatcher\EventSubscriberInterface' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\http-kernel\EventListener\FragmentListener.php:34 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\http-kernel\EventListener\FragmentListener.php on line 34