Objectmapper: Las etiquetas de argumento '(_:)' no coinciden con ninguna sobrecarga disponible

tengo modelo:

class Branch: Mappable {
    var id: Int!
    var name: String!
    var city: String!
    var address: String!
    var base_url: String!
    var image: String?
    var caffe: Bool!
    var restaurant: Bool!
    var latitude: String!
    var longitude: String!
    var phone: String!
    var mobtel: String!
    var ft_count: Int!
    var ft_grouped_count: String!

    required init?(map: Map) {

    }

    func mapping(map: Map) {
        id <- map["id"]
        name <- map["name"]
        city <- map["city"]
        address <- map["address"]
        base_url <- map["base_url"]
        image <- map["image"]
        caffe <- map["caffe"]
        restaurant <- map["restaurant"]
        latitude <- map["latitude"]
        longitude <- map["longitude"]
        phone <- map["phone"]
        mobtel <- map["mobtel"]
    }
}

y:

                        let jsonObj = JSON(response.result.value)
                        for obj in jsonObj {
                            let branch = Mapper<Branch>().map(obj.1.rawString()!) // error here
                            self.results.append(branch!)
                        }

pero estoy recibiendo un error:

Argument labels '(_:)' do not match any available overloads

en esta línea let branch = Mapper<Branch>().map(obj.1.rawString()!) .

Esto funcionó antes, ¿es este error?