title: Android Studio Removes R during Debug
body: <p>Yesterday, I was preparing to run an app that has worked perfectly for weeks when I accidentally pushed the debug button instead of the run button. While before I had 0 errors now I have over 20. All of them have to do with not resolving the R class anymore. </p>
  
  <p>I have combed stackoverflow and tried many of the "fixes" but to no avail. I have tried cleaning, rebuilding, syncing, manually importing then rebuilding etc etc. Most of those fixes come from last year anyway. I am using version 0.5.2. I am new to Android development and Android studio (and stackoverflow for that matter) so I apologize if this question is trivial or has been answered before. </p>
  
  <p>Solved:</p>
  
  <p>There was an undisclosed error in a string resource.</p>
  
  <p><a href="https://stackoverflow.com/questions/4414389/android-xml-percent-symbol">Android XML Percent Symbol</a></p>
  
  <p>...is roughly equivalent to my mistake.</p>