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