Swift, Combine getting error after trying to download array of model type data when I have resolved all JSON fields from it

Question

Error message: Swift.DecodingError.keyNotFound(CodingKeys(stringValue: "countries", intValue: nil), Swift.DecodingError.Context(codingPath: [], debugDescription: "No value associated with key CodingKeys(stringValue: "countries", intValue: nil) ("countries").", underlyingError: nil)) Models:

   struct ResponseModel: Codable {
        let countries: [CountryModel]
    }

struct CountryModel: Codable, Identifiable {
    let countryName: String?
    let uuid: String?
    let totalHolidays: Int?
    let iso: String?
    var id: String {
        return uuid ?? UUID().uuidString
    }
    
    enum CodingKeys: String, CodingKey {
        case countryName = "country_name"
        case iso = "iso-3166"
        case totalHolidays, uuid
    }
}

Service:

class CountryDataService: ObservableObject {
    
    @Published var allCountries = ResponseModel(countries: [CountryModel]())
    
    var countriesSubscription: AnyCancellable?
    
    init() {
        getCountries()
    }
    
    func getCountries() {
        guard let url = URL(string: "https://calendarific.com/api/v2/countries?api_key=\(K.apiKey)") else { return }
        
        countriesSubscription = NetworkingManager.download(url: url)
            .decode(type: ResponseModel.self, decoder: JSONDecoder())
            .sink(receiveCompletion: NetworkingManager.handleCompletion, receiveValue: { [weak self] (returnedCountries) in
                self?.allCountries = returnedCountries
                self?.countriesSubscription?.cancel()
            })
    }
}

Piece of json data:

{
  "meta": {
    "code": 200
  },
  "response": {
    "url": "https://calendarific.com/supported-countries",
    "countries": [
      {
        "country_name": "Afghanistan",
        "iso-3166": "AF",
        "total_holidays": 24,
        "supported_languages": 2,
        "uuid": "f0357a3f154bc2ffe2bff55055457068"
      },