title: /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-gcc-4.2 failed with exit code 1
body: <p>I got this error message below:</p>
  
  <pre><code>ld: file not found: ../three20/Build/Products/Debug-iphonesimulator/libThree20UICommon.a
  collect2: ld returned 1 exit status
  Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-gcc-4.2 failed with exit code 1
  </code></pre>
  
  <p>it told me that <code>libThree20UICommon.a</code> is missing.
  But I've remove <code>Three20</code> from my project and code related to Three20.
  is there anything else i have to do with it?</p>
  
  <p>Thanks.</p>