Fatal error: Uncaught Error: Interface "Flarum\Extend\ExtenderInterface" not found in /home/sardosne/flarum.sardos.net/vendor/flarum/core/src/Extend/Post.php:16 Stack trace: #0 {main} thrown in /home/sardosne/flarum.sardos.net/vendor/flarum/core/src/Extend/Post.php on line 16