Fatal error: Uncaught Error: Interface "Skyboard\Application\NonBoard\NonBoardHandler" not found in /home/supratz/www/skyboard-refac-backup/backend/src/Application/NonBoard/Handlers/UserSubscribeCategoryHandler.php:14 Stack trace: #0 {main} thrown in /home/supratz/www/skyboard-refac-backup/backend/src/Application/NonBoard/Handlers/UserSubscribeCategoryHandler.php on line 14