title: Xcode 6.3.2 refactor -> rename not working
body: <p>i've recently installed <code>OS X Yosemite</code> to upgrade <code>Xcode 6.3</code> and have installed <code>Xcode 6.3.2</code>.<br>
  But it seems like <code>refactor -&gt; rename</code> is not working in <code>Xcode 6.3.2</code>. (screenshot attached below)<br>
  The same thing is happening when i try to rename a file, function or variable from <code>Edit -&gt; Refactor -&gt; Rename</code>.<br>
  I want to know if anybody else has faced this issue?<br>
  If yes, has anybody managed to find a workaround for this?  </p>
  
  <p><img src="https://i.stack.imgur.com/fNKQz.png" alt="Error when trying to rename something from &lt;code&gt;Edit -&gt;  Refactor&lt;/code&gt;"></p>