Fatal error: Uncaught Error: Class "Opis\Closure\SerializableClosure" not found in /opt/lampp/htdocs/forum/flarum/vendor/illuminate/queue/SerializableClosure.php:10 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/illuminate/queue/SerializableClosure.php on line 10