声明嵌套模型

Question

class GeoneMapViewModel: GeoneBaseModel,NSCoding {

    var userInitMaps = [GeoneMapLayerModel]()

    var defaultMapExtent:String?

    var token = [GeoneToken]()

    var baseMap = [GeoneMapLayerModel]()

}

class GeoneToken: GeoneBaseModel {

    var id:String?

    var label:String?

    var tokenUrl:String?
}

func saveToken() {
    for token in mapViewModule!.token {

        token.save()
    }
}   

到此，崩溃..

  

致命错误：NSArray元素无法匹配Swift数组元素类型

我的方式是错的吗？