Fatal error: Uncaught Error: Class 'Whoops\Handler\Handler' not found in /srv/www/c5www/html/updates/concrete5-8.5.1/concrete/vendor/filp/whoops/src/Whoops/Handler/JsonResponseHandler.php:16 Stack trace: #0 {main} thrown in /srv/www/c5www/html/updates/concrete5-8.5.1/concrete/vendor/filp/whoops/src/Whoops/Handler/JsonResponseHandler.php on line 16