Fatal error: Uncaught Error: Class "core\task\scheduled_task" not found in /srv/www/htdocs/moodle/lib/editor/atto/classes/task/autosave_cleanup_task.php:31 Stack trace: #0 {main} thrown in /srv/www/htdocs/moodle/lib/editor/atto/classes/task/autosave_cleanup_task.php on line 31