Fatal error: Uncaught Error: Class "Symfony\Component\Routing\Router" not found in D:\xampp\htdocs\pimcore\my-project\vendor\symfony\framework-bundle\Routing\Router.php:34 Stack trace: #0 {main} thrown in D:\xampp\htdocs\pimcore\my-project\vendor\symfony\framework-bundle\Routing\Router.php on line 34