Fatal error: Uncaught Error: Class "Flarum\Foundation\AbstractServiceProvider" not found in /opt/lampp/htdocs/forum/flarum/vendor/fof/sitemap/src/Providers/Provider.php:30 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/fof/sitemap/src/Providers/Provider.php on line 30