Fatal error: Uncaught Error: Interface "Whoops\Handler\HandlerInterface" not found in /srv/www/sites/public/starter-projects/vendor/filp/whoops/src/Whoops/Handler/Handler.php:15 Stack trace: #0 {main} thrown in /srv/www/sites/public/starter-projects/vendor/filp/whoops/src/Whoops/Handler/Handler.php on line 15