When I click on the Google+ login button I get a toast naming an "internal error". No error is logged. Also I'm using at the same time the google map api's with no problem, so I think the key value is correct. So what's the problem?
The PlusClient initialization:
mPlusClient = new PlusClient.Builder(this, this, this)
.setActions("http://schemas.google.com/AddActivity", "http://schemas.google.com/BuyActivity")
.setScopes("PLUS_LOGIN") // Space separated list of scopes
.build();