Fatal error: Uncaught Error: Class "Flarum\Api\Serializer\AbstractSerializer" not found in /home/sardosne/flarum.sardos.net/vendor/flarum/extension-manager/src/Api/Serializer/TaskSerializer.php:16 Stack trace: #0 {main} thrown in /home/sardosne/flarum.sardos.net/vendor/flarum/extension-manager/src/Api/Serializer/TaskSerializer.php on line 16