Minimal project can't able to authenticate

After giving so much time towards my game authentication problem solution, I decided to go from scratch with template project.

So I downloaded Minimal project available in github and imported google-play plugin v9.30.

Just applied my application setting and try to run same project but that also can’t able to authenticate.
I am getting this type of log message.

I have already updated recent version of sdk so not exist this kind of mistake.
Following image demonstrate my plugin/android data so that you become somewhat more clear.

63562-pluginandroidfolderdata.png

Please guide me to solve this problem, I am available always if you have any questions regarding problem.

For this I just transfer my project from Unity 4.6+ version to Unity 5.3+ version and then same project works smoothly. I just removed all plugins data and import latest plugin again into project.

So please first try with this one then think about any other possibilities because I spent around week in this problem. I hope this become useful to other members.