title: Xcode 5 Couldn't build module Cocoa after installing Xcode 6 beta 2
body: <p>I just installed Xcode 6 beta 2. After trying it out, I wanted to continue my work and build a project (created with 5.1 and never opened in Xcode 6), in Xcode 5.1 but I get the following error:</p>
  
  <pre><code>Could not build module 'Cocoa'
  </code></pre>
  
  <p>The prefix file the error is coming from looks like this (I didn't modified it):</p>
  
  <pre><code>#ifdef __OBJC__
      #import &lt;Cocoa/Cocoa.h&gt;
  #endif
  </code></pre>
  
  <p>Every time I try to build this message is logged:</p>
  
  <pre><code>xpcd[235]: Info.plist does not contain an XPCService dictionary: /System/Library/Frameworks/Security.framework/XPCServices/SecurityAgent.xpc
  </code></pre>
  
  <p>I'm not sure the above message has anything to do with the problem.</p>
  
  <p>Additionally now it seems to me like I can't build any project using Xcode 5.</p>