This is the first time that I put in one game the Google Play Game Services.
I’ve read all the tutorial of GitHub and I’ve followed the steps, I have everything downloaded (the google play games services, the google repository, etc.) but when I click to the setup button in the game resources (going to Window → Google Play Games → Setup → Android Setup) it launches me an error: Invalid classname: Exception has been thrown by the target of an invocation.
Despite this, the resources file is generated.
What does it mean? Should not I worry?