title: Xcode 4 Error: Error Starting Executable
body: <p>I ran into problem with testing my app on iOS and Xcode when I am uploading it to my actual devices (iphone and iPad), and I'm wondering if someone knows the issue and can help me out:</p>
  
  <p>Normally when I build my app on my devices, the app is installed and launched on my devices. But as I am preparing for submitting my first app I was testing around and changing the Bundle Identifier, App ID, and Development Provisions (so the issue may have something to do with it), and now, when I try to build my app on my devices, although it's installed on my devices fine, Xcode will not launch the app anymore. Instead, I got this error message:</p>
  
  <blockquote>
    <p>Error Starting Executable. 
    Error launching remote program: No such file
    or directory.</p>
  </blockquote>
  
  <p>Does anyone know what the issue is? And What is this derived data folder about?</p>
  
  <p>Much thanks!</p>