title: What Does Question Mark Mean in Xcode Project Navigator?
body: <p>In the project navigator in Xcode, I am not sure what the ? is trying to tell me next to the file name.</p>
  
  <p><br>
  <img src="https://i.stack.imgur.com/MUvxw.png" alt="Screen Shot"></p>
  
  <p>I am sure it is not a coincidence that this is the same file that I dragged from my root directory for the project to the Classes folder (because the .mm file was there and I wanted them to be together). The project still compiles just fine, however my code sense broke recently and I am wondering whether this may be part of the issue.</p>
  
  <p>Thanks!</p>