Fatal error: Uncaught Error: Class "Symfony\Component\Translation\Loader\FileLoader" not found in D:\Apache24\www\qilu\back-end\vendor\symfony\translation\Loader\JsonFileLoader.php:21 Stack trace: #0 {main} thrown in D:\Apache24\www\qilu\back-end\vendor\symfony\translation\Loader\JsonFileLoader.php on line 21