Fatal error: Uncaught Error: Interface "League\Flysystem\PluginInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/league/flysystem/src/Plugin/AbstractPlugin.php:8 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/league/flysystem/src/Plugin/AbstractPlugin.php on line 8