Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\Fragment\FragmentHandler" not found in D:\Apache24\www\sciegen\backend\vendor\symfony\http-kernel\DependencyInjection\LazyLoadingFragmentHandler.php:24 Stack trace: #0 {main} thrown in D:\Apache24\www\sciegen\backend\vendor\symfony\http-kernel\DependencyInjection\LazyLoadingFragmentHandler.php on line 24