Fatal error: Uncaught Error: Class 'Whoops\Handler\Handler' not found in C:\xampp\htdocs\admin\vendor\filp\whoops\src\Whoops\Handler\XmlResponseHandler.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\filp\whoops\src\Whoops\Handler\XmlResponseHandler.php on line 17