I can not setup android configuration.
Error:
Invalid classname: An exception was thrown by the type initializer for GooglePlayGames.Editor.GPGSDependencies
My env:
Unity: 5.3.5f1
PlayGames Plugin: 0.9.34
Platform: Android
try the following:

It's still not working.
I installed 'Google Play Services' on SDK Manager.
try to update :
Thank you @junkiesdevstudio , it worked
worked for me !
Thanks @junkiesdevstudio
Did not work for me. The error still persists Anyone else tried this?
Make sure there is only one copy of the "play-services-xxx" jar or aar files in your project. I think the .unitypackage ships with play-services-base-9.4.0, and play-services-games-9.4.0, etc... under Assets/Android/ folder.
If you have an older copy of play-services jars somewhere in your project then you will get this error. Also, whatever version you do have in your project has to be above v9.
Lastly, any change you make to the jar files (adding or deleting one) requires restarting Unity.
Many thanks Mike for all your support. It now works! Cheers.
Make sure there is only one copy of the "play-services-xxx" jar or aar files in your project. I think the .unitypackage ships with play-services-base-9.4.0, and play-services-games-9.4.0, etc... under Assets/Android/ folder.
Where would i find the files referred to above? Don't have an "Android" folder in my unity Assets. Tried all the solutions in this thread and still have this error
Most helpful comment
try to update :