Error with Google Play Services

I get this error when I try to add Google play Services.

What’s wrong?

There’s a ticket open on their github for this problem: Invalid classname Error when setup pressed · Issue #1207 · playgameservices/play-games-plugin-for-unity · GitHub

I had the same problem with the 0.9.34 Unity Package. I worked around it by going back to 0.9.33.

You can get the older build here:

Thanks for the answer but even by going back to 0.9.33 I still get the same problem.