Fatal error: Uncaught Error: Class "Whoops\Handler\Handler" not found in I:\www\frameworks\Laravel\vendor\filp\whoops\src\Whoops\Handler\XmlResponseHandler.php:17 Stack trace: #0 {main} thrown in I:\www\frameworks\Laravel\vendor\filp\whoops\src\Whoops\Handler\XmlResponseHandler.php on line 17