Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher' not found in C:\xampp\htdocs\print\vendor\symfony\http-kernel\Tests\Fixtures\TestEventDispatcher.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\print\vendor\symfony\http-kernel\Tests\Fixtures\TestEventDispatcher.php on line 16