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.