Fatal error: Uncaught Error: Class "Symfony\Component\Config\Loader\FileLoader" not found in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\symfony\routing\Loader\PhpFileLoader.php:28 Stack trace: #0 {main} thrown in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\symfony\routing\Loader\PhpFileLoader.php on line 28