Gree integration problem

I imported the Gree SDK into my Unity (indie version) and after read the first steps in GREE Developer's Guide, I tried to make the basic script for User Authorization. But I have a problem in the code that I can't figure out how to fix:

 Gree.Authorizer.Login (onLogin:( user ) => {
 Debug.Log (String.Format ("C# onLogin user={0}", user.userName));
 } , (string message) => {
 Debug.Log ("Login error: " + message);
 });

The editor's warning says that "Named arguments must appear after the positional arguments". I realize that the autocomplete options for Gree.Authorizer.Login ( does't have the onLogin option.

Heres the complete code:

 using System;
 using UnityEngine;
 using System.Collections.Generic;
 using System.Collections;
 using Gree;
 
 public class NewBehaviorScript : MonoBehaviour {
 
     string id, userName;
     private Gree.User localUser;
     // Use this for initialization
     void Start ()
     {
         Gree.Authorizer.Login (onLogin:( user ) => {
         Debug.Log (String.Format ("C# onLogin user={0}", user.userName));
         } , (string message) => {
         Debug.Log ("Login error: " + message);
         });
         id = null;
         userName = null;
     }
     
     // Update is called once per frame
     void Update () {
     
     }
     
     void OnGUI ()
     {
         GUIStyle style = new GUIStyle ();
         style.fontSize = 50;
         float x = 120.0f;
         float y = 120.0f;
         float width = 400.0f;
         float height = 100.0f;
         string token = Gree.Authorizer.GetOAuthAccessToken();
         
         if (token == null)
         localUser = null;
         
         if (localUser == null) {
         localUser = Gree.Platform.GetLocalUser();
         } else {
             this.id = localUser.id;
             this.userName = localUser.userName;
         }
         
         if (this.id != null) {
             GUI.Label (new Rect (x, y, width, height), "user id = " + this.id);
         }
         
         y += height + 20.0f;
         
         if (this.userName != null) {
             GUI.Label (new Rect (x, y, width, height), "user name = " + this.userName);
         }
         
         y += height + 60.0f;
         if (GUI.Button (new Rect (x, y, width, height), "Logout")) {
     
         }
     }
 }
 

Any suggestions???