Fatal error: Uncaught Error: Class "Symfony\Component\Config\Loader\Loader" not found in C:\WebServer\htdocs\bookshelf\vendor\symfony\routing\Loader\AttributeServicesLoader.php:22 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\vendor\symfony\routing\Loader\AttributeServicesLoader.php on line 22