title: error adding files to project
body: <p>Something weird happened and interested in insights.</p>
  
  <p>I created 5 new custom button images in Photoshop and saved them as .png files. Opened my project, navigated to a "buttons" group in the side-bar, and deleted the existing placeholder custom button images. Then did an "Add Files…" to add my new images.</p>
  
  <p>Xcode displayed an error message saying "Multiple errors occurred while copying files". The system Console had an error saying: "2/13/13 8:12:18.027 AM Interface Builder Cocoa Touch Tool[1623]: CFPreferences: user home directory at file://localhost/Users/jack/Library/Application%20Support/iPhone%20Simulator/User/ is unavailable. User domains will be volatile."</p>
  
  <p>The resulting image files in the "buttons" group all showed up red. I tried cleaning, deleting the Derived Data, but wasn't able to get the files recognized through typical means.</p>
  
  <p>What partially worked was to manually copy the files into the project folder, then manually - for each image name in red in the "buttons" folder - click on the location icon (see image below) to explicitly choose the image file I had just copied to the project folder.</p>
  
  <p>However, when I tried to build, I got a bunch of compiler errors with references to the images files not existing to copy into the bundle.</p>
  
  <p><img src="https://i.stack.imgur.com/brLKB.png" alt="enter image description here"></p>