This particular error is specific to Google's login services, so it's possible that service is having issues in whatever region you're playing in. Often times it's temporary, but if it last longer than a day, I recommend reaching out to our customer service team and they can walk you through some potential workarounds. skullgirlsmobile.com/contact
Once you're able to access your account, I highly recommend you additionally bind your account using the generic 'Email' option, which doesn't rely on Google or Facebook services.