Google Play Game Services - Plugin Help

I installed this https://github.com/playgameservices/play-games-plugin-for-unity to show a leaderboard in my game. When I run the game on a device,during authentication the following message is throwm at adb console. For me it sounded like the android complaining about googleplay-service package is missing. But, i can definitely say it is there under sdk/extras/google. And what is that " NullReferenceException: Object reference not set to an instance of an object" in the stacktrace? What has gone wrong? Anyone has any ideas? Thanks in advance.

AndroidJavaException: java.lang.ClassNotFoundException: com.google.example.games.basegameutils.GameHelper
at UnityEngine.AndroidJNISafe.CheckException () [0x00000] in <filename unknown>:0
at UnityEngine.AndroidJNISafe.CallStaticObjectMethod (IntPtr clazz, IntPtr methodID, UnityEngine.jvalue[] args) [0x00000] in <filename unknown>:0
at UnityEngine.AndroidJavaObject._CallStatic[AndroidJavaObject] (System.String methodName, System.Object[] args) [0x00000] in <filename unknown>:0
at UnityEngine.AndroidJavaObject.CallStatic[AndroidJavaObject] (System.String methodName, System.Object[] args) [0x00000] in <filename unknown>:0
at UnityEngine.AndroidJavaObject.FindClass (System.String name) [0x00000] in <filename unknown>:0
at UnityEngine.AndroidJavaObject._AndroidJavaObject (System.String className, System.Object[] args) [0x00000] in <filename unknown>:0
at UnityEngine.AndroidJavaObject..ctor (System.String className, System.Object[] args) [0x00000] in <filename unknown>:0
at GooglePlayGames.A
NullReferenceException: Object reference not set to an instance of an object
at GooglePlayGames.Android.AndroidClient+<Authenticate>c__AnonStorey1.<>m__1 () [0x00000] in <filename unknown>:0
at UnityEngine.AndroidJavaRunnableProxy.run () [0x00000] in <filename unknown>:0
at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
Rethrow as TargetInvocationException: UnityEngine.AndroidJavaRunnableProxy.run()
at UnityEngine.AndroidJavaProxy.Invoke (System.String methodName, System.Object[] args) [0x00000] in <filename unknown>:0
at UnityEngine.AndroidJavaProxy.Invoke (System.String methodName, UnityEngine.AndroidJavaObject[] javaArgs) [0x00000] in <filename unknown>:0
at UnityEngine._AndroidJNIHelper.InvokeJavaProxyMethod (UnityEngine.AndroidJavaProxy proxy, IntPtr jmethodName, IntPtr jargs) [0x00000] in <filename unknown>:0

Update:

I found out that missing class is basically provided by the plugin. Therefore, I downloaded the source and ran everything in the ADT. Still it was giving the same error. Now I have started to doubt my sanity. IMy brain cell must be dying.

 

Finally Found out that, you should not use any thing google releases with big hype.

https://groups.google.com/forum/#!topic/google-admob-ads-sdk/XMYDhPRlZFI

Give my 3 hours back google - I could have written my own plugin. :-/

 

The Current version published on Feb 20 2014 works well.

 

I'm having the same problem with the latest version of the plugin... Everything looks ok on both sides (dashboard and code)... Can you help me?

 

I am experiencing the same, so if anyone has a clue, that would be greatly appreciated!

 

did you use stripping level without link.xml?

https://docs.unity3d.com/Documentation/Manual/iphone-playerSizeOptimization.html

for example...

Code (csharp):

1.  
2. <linker>
3.     <assembly fullname="UnityEngine">
4.         <type fullname="UnityEngine.AndroidJavaRunnableProxy" preserve="all"/>
5.     </assembly>
6. </linker>
7.  

 

https://github.com/playgameservices/play-games-plugin-for-unity/issues/81