today I just imported a sample app from Android SDK as a module in my project (analytics) and suddenly I got this gradle error when I try to sync it: Plugin is too old
If you want to continue to use the newest development versions then this problem can reoccur each time your version is far enough out of date.
I've been keeping an up-to-date list of the most current development versions as well as the stable version on my answer to this similar question, so that I can fix it each time I get a new warning:
Android Studio 2.0 - Plugin is too old, please update to a more recent version, or set ANDROID_DAILY_OVERRIDE