title: No resource found that matches the given name (at 'text' with value '@string/continue_label')
body: <p>Let me start off by saying I'm brand new to Android programming.  I'm using a Pragmatic's Hello Android book (3rd edition).  I'm working on the popular sudoku game example, and after copying the code from the book that is to be placed in the main.xml file, I get the following errors:</p>
  
  <pre><code>error: Error: No resource found that matches the given name (at 'background' with value '@color/background')
  .
  error: Error: No resource found that matches the given name (at 'text' with value '@string/main_title').
  
  error: Error: No resource found that matches the given name (at 'text' with value '@string/continue_label').
  
  error: Error: No resource found that matches the given name (at 'text' with value '@string/new_game_label').
  
  error: Error: No resource found that matches the given name (at 'text' with value '@string/about_label').
  
  error: Error: No resource found that matches the given name (at 'text' with value '@string/exit_label').
  </code></pre>
  
  <p>They're probably all related, but after doing some searching, I don't know what the problem is.  Any suggestions?</p>