Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Tests\AbstractEventDispatcherTest' not found in E:\xampp\htdocs\vendor\symfony\event-dispatcher\Tests\EventDispatcherTest.php:16 Stack trace: #0 {main} thrown in E:\xampp\htdocs\vendor\symfony\event-dispatcher\Tests\EventDispatcherTest.php on line 16