Getting JNI Error when Implementing Google Play Games/Services

Unity Engine
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1

My team and I have been trying to implement Google Play Games Achievements and Leader boards into our game. We have tried several plugin solutions including GitHub - faizann/UnityGPGPlugin: Unity3D Google Play Services Plugin and Carlos' words: Store

Regardless we get the following error.

Exception: JNI: Init’d AndroidJavaClass with null ptr!

Someone recommended rolling back our Android SDK to Rev 21 which did not resolve the issue.
Would greatly appreciate any input.

2

Android plugins don’t work on Unity editor. If it’s the error on Android device, you should provide more information like your Android Manifest, and the code causing this issue.