title: Android SDK is not specified
body: <p>I use Intellij Idea 12. Some days ago all works fine, but now I get error </p>
  
  <p><code>Android Source Generator: [facebook] Android SDK is not specified</code>.
  Project settings you can see on a picture. I try to rebuld project but it does not help me.</p>
  
  <p><img src="https://i.stack.imgur.com/WB4pW.png" alt="project settings"></p>