title: FileMerge error message when used with Git difftool
body: <p>I use FileMerge as the <code>difftool</code> tool for Git. Recently, I started receiving a weird error message:</p>
  
  <pre><code>Unable to load platform at path /Applications/Xcode.app/Contents/
     Developer/Platforms/iPhoneOS.platform
  </code></pre>
  
  <p>FileMerge still performs the diff just fine (although it takes a bit longer to load). Any idea what's causing this, and how to fix it?</p>