title: iphone: Building error precompiling app_prefix.pch
body: <p>I dont know what happened to Xcode. I was debugging my app when after a while of writing some code I tried to compile and an error message appeared:</p>
  <blockquote>
  <p>Building error precompiling app_prefix.pch
  arm-apple-darwin9-gcc-4.2.1: te: no such file or directory</p>
  </blockquote>
  <p>I had never this error before, and I am not sure how to solve it.</p>