title: iOS 7.1 gives error after updating to Xcode 5.1
body: <p>I have updated my Xcode to version 5.1 recently. After update, it runs fine with all simulators except iOS 7.1, in which it gives a mach-O link error. Moreover, there is only a 64-bit architecture option in 'Build setting' tab. According to me, it is the cause of all the problems &amp; errors. Does anybody know reason for this &amp; how to solve it?</p>
  
  <p>Here are some warnings &amp; errors I've got:</p>
  
  <p>Warning :</p>
  
  <pre><code>Values of type 'NSInteger' should not be used as format arguments; add an explicit cast to 'long' instead
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>Symbol(s) not found for architecture x86_64
  </code></pre>
  
  <p>Thanks.</p>