Fatal error: Uncaught Error: Class "Symfony\Component\Config\Loader\FileLoader" not found in C:\xampp\htdocs\adminlte3\vendor\symfony\routing\Loader\GlobFileLoader 2.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\adminlte3\vendor\symfony\routing\Loader\GlobFileLoader 2.php on line 22