title: External drive lost power and derived data folder was deleted; now Xcode project fails build
body: <p>Aloha everyone,</p>
  
  <p>I have all of my Xcode files on an external drive, so that I can just plug in the drive when i want to pick up any of my projects.  Unfortunately, we suffered a power failure, only for a couple of minutes, during a rainstorm here on Oahu.  After i booted everything back and got back in Xcode, I got a series of errors and one warning.  The errors indicate that my project was pointed to directories that no longer exist.  Please take a look at the output and let me know if any here knows how to fix this, or if I will have to create another project and start all over.</p>
  
  <p><a href="http://crispinworks.com/files/xcodeError.png" rel="nofollow">Here is the error page from Xcode</a> </p>
  
  <p><a href="http://crispinworks.com/files/folderListing.png" rel="nofollow">Here is my directory listing</a> </p>
  
  <p>The directories no longer exist, so I can not delete them from the Organizer.  I am resigned to start over with a new project, if necessary, but would rather find a way to fix the issue with the current project.</p>