Fatal error: Uncaught Error: Class 'Whoops\Handler\Handler' not found in /opt/lampp/htdocs/us/vendor/filp/whoops/src/Whoops/Handler/CallbackHandler.php:16 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/us/vendor/filp/whoops/src/Whoops/Handler/CallbackHandler.php on line 16