TKChartDataPoint does not conform to expected type Sequence

var r = [Int](range.lowerBound..<range.upperBound)

let text : String = "12345"
var digits = [Int]()
for element in text.characters {
    digits.append(Int(String(element))!)
}

@IBAction func signUpButtonTapped(_ sender: Any) {
    print("Registrer ny bruker")

    guard let firstName = firstNameTextField.text,
      let lastName = lastNameTextField.text,
      let email = emailAdressTextField.text,
      let password = passwordTextField.text,
      let repeatedPassword = repeatPasswordTextField.text else {
          // If any of the values above is empty, just return
          return
      }

    // We avoid force unwrapping with the guard above
    // so the values we test for here are not optional 
    if firstName.isEmpty ||
       lastName.isEmpty ||
       password.isEmpty ||
       repeatedPassword.isEmpty {
        // Display alert message and return
        return
    }

    // Validate password
    if password != repeatedPassword {
        return
    }

}

public static var enabledLoggingBehaviors: Set<SDKLoggingBehavior> {
    get {
      let behaviors = FBSDKSettings.loggingBehavior().compactMap { object -> SDKLoggingBehavior? in
        if let value = object as? String {
          return SDKLoggingBehavior(sdkStringValue: value)
        }
        return nil
      }
      return Set(behaviors)
    }
    set {
      let behaviors = newValue.map({ $0.sdkStringValue })
      FBSDKSettings.setLoggingBehavior(Set(behaviors))
    }
  }

var skc = String(data: Data(skcSpec.getEncoded()), encoding: .utf8)!