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This issue means you have accidentally deleted the "google play services" files or libraries.
I am also having the same issue Please tell me if you can find the solution. (for me Admob is not necessary any ad nework work will be acceptable. )
I agree I am I am also unable to find the secret of its Movement on Android device
I am unable to find a solution for Ads in Unity for Windows Phone 8.1 A I came to know that Admob is not supporting Windows Phone 8.1 Unity....
v v thanks for your effort it solved the issue unity should include this feature builtin