fuel_validation_rules

if (Input::get('q')) {
    $validator = Validation::forge('navbar-saerch');

    $validator->add_field('q', '', 'required|min_length[4]|max_length[32]');

    if($validator->run()) //it always returns FALSE
    {
        var_dump($validator->validated());
    }
    else
    {
        //in every case, it goes here, but the Errors-Array is also always empty
        var_dump($validator->error());
    }
}