title: Getting error after updating xcode 5.0 to 5.1
body: <p>I have updated the xcode 5.0 to 5.1 today. I run the existed project but getting the error now. I had no issues while running that project on 5.0 version. The error is below :</p>
  
  <pre><code>ld: library not found for -lIOKit
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  
  <p>Please someone help.</p>
  
  <p>I re-added the frameworks but now I get another error which is below </p>
  
  <pre><code>ld: 62 duplicate symbols for architecture armv7s
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>