Fatal error: Uncaught Error: Interface "Illuminate\Contracts\Validation\Rule" not found in /opt/lampp/htdocs/forum/flarum/vendor/illuminate/validation/ClosureValidationRule.php:7 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/illuminate/validation/ClosureValidationRule.php on line 7