Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\Fragment\FragmentHandler' not found in C:\xampp\htdocs\admin\vendor\symfony\http-kernel\DependencyInjection\LazyLoadingFragmentHandler.php:23 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\symfony\http-kernel\DependencyInjection\LazyLoadingFragmentHandler.php on line 23