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
As a side note, I have been getting the same error in completely unrelated situation - after my system clock year setting has been changed (i.e. 2015 -> 2016); changing the clock back to the correct one solved the issue.
Note 1: I'm posting this mainly because I had the exactly same error message, but the working solution proven to be different than just updating the plugin's version (as posted by Jared Burrows).
Note 2: using
classpath 'com.android.tools.build:gradle:+'
can make the plugin version default to newest one. Bear in mind that your build may break on API changes (and is, for that very reason, discouraged by Android API docs), so use this at your own risk only if you're constantly updating the version anyway.