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