title: intellij 13 weird scala error: many unresolved symbols
body: <p>I am facing a weird issue in intellij 13, as shown here</p>
  
  <p><img src="https://i.stack.imgur.com/zlC2F.png" alt="enter image description here"></p>
  
  <p>Many of the methods are not resolved. Is it about scala version? But I do already have this as 2.9.2, as shown here<img src="https://i.stack.imgur.com/yt8At.png" alt="enter image description here">.</p>