Stripe iOS Create BankAccount Token error handling

var bankAccountParams = STPBankAccountParams()
    bankAccountParams.accountHolderName = "Jenny Rosen"
    bankAccountParams.country = "US"
    bankAccountParams.routingNumber = "110000000"
    bankAccountParams.accountNumber = "00044"

    print("Bank account parameters: ")
    print(bankAccountParams)

    STPAPIClient.shared.createToken(withBankAccount: bankAccountParams) { token, error in
      if let error = error {
        print(error)
        if let detailedError = error as? NSError {
          print("error_code: " + (detailedError.userInfo["com.stripe.lib:StripeErrorCodeKey"] as! String))
          print("error_type: " + (detailedError.userInfo["com.stripe.lib:StripeErrorTypeKey"] as! String))
          print("error parameter: " + (detailedError.userInfo["com.stripe.lib:ErrorParameterKey"] as! String))
          print("error_message: " + (detailedError.userInfo["com.stripe.lib:ErrorMessageKey"] as! String))
        }
      }

      else {
        print(token)
      }
    }

/*
Output:

Bank account parameters:
<Stripe.STPBankAccountParams: 0x600001912920; routingNumber = 110000000; last4 = 0044; country = US; currency = ;

Error Domain=com.stripe.lib Code=50 "There was an unexpected error -- try again in a few seconds" UserInfo={com.stripe.lib:StripeErrorTypeKey=invalid_request_error, com.stripe.lib:StripeErrorCodeKey=account_number_invalid, com.stripe.lib:ErrorMessageKey=You must use a test bank account number in test mode. Try 000123456789 or see more options at https://stripe.com/docs/connect/testing#account-numbers., com.stripe.lib:ErrorParameterKey=bankAccount[AccountNumber], NSLocalizedDescription=There was an unexpected error -- try again in a few seconds}

error_code: account_number_invalid
error_type: invalid_request_error
error parameter: bankAccount[AccountNumber]
error_message: You must use a test bank account number in test mode. Try 000123456789 or see more options at https://stripe.com/docs/connect/testing#account-numbers.
*/