Fatal error: Uncaught Error: Interface "Flarum\Extend\ExtenderInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/fof/sitemap/src/Extend/ForceCached.php:23
Stack trace:
#0 {main}
thrown in /opt/lampp/htdocs/forum/flarum/vendor/fof/sitemap/src/Extend/ForceCached.php on line 23