Symbol(s) not found for architecture arm64 (Unity 5.3.1f, Xcode 7.2)

Hello,
I use Unity 5.3.1f and Xcode 7.2

I write, a game and use standard social for Game Center (Leader Board and Achievements).
Achievements

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Runtime.InteropServices;
4. public static class achievements {
5. [DllImport("__Internal")]
6. public static extern void _ReportAchievement( string achievementID, float progress );
7. }

And report by

Code (CSharp):

1. achievements._ReportAchievement("MyAchievementID", 100.0f);

But when I try to build project in Xcode, I have error:
"__ReportAchievement", referenced from:
_achievements__ReportAchievement_m58478526_0 in Bulk_Assembly-CSharp_0.o
(maybe you meant: _achievements__ReportAchievement_m58478526_0)
Symbol(s) not found for architecture arm64"
clang: error: linker command failed with exit code 1 (use -v to see invocation)

 

In description for Unity 5.3.1p4 I found that they add support Xcode 7.3 and more important: "don't use __declspec attributes" http://unity3d.com/unity/qa/patch-releases/5.3.1p4

The main trouble is:

Code (CSharp):

1. [DllImport("__Internal")]

http://docs.unity3d.com/Manual/PluginsForIOS.html

I solve my problem with GameCenter (Leaderboards and Achievements) using standard Social without any plugins for iOS.

And solve problem with Plugins, need to select File - Build Settings - Symlink Unity libraries
Good luck!

 

Symbol(s) not found for architecture arm64"
clang: error: linker command failed with exit code 1 (use -v to see invocation)

You probably just need to import the relevant frameworks in xcode. Click on the top of the project hierarchy > General > Scroll to bottom where frameworks are -> Add -> GameKit.framework

https://developer.apple.com/library/ios/documentation/GameKit/Reference/GameKit_Collection/