Fatal error: Uncaught Error: Class "Symfony\Component\Config\Loader\FileLoader" not found in C:\WebServer\htdocs\bookshelf\vendor\symfony\routing\Loader\DirectoryLoader.php:18 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\vendor\symfony\routing\Loader\DirectoryLoader.php on line 18