title: include(OAuth.php): failed to open stream: No such file or directory error in Yiidropbox extension
body: <p>When I tried to run </p>
  
  <pre><code>$dropbox = Yii::app()-&gt;dropbox;
  </code></pre>
  
  <p>as mentioned in <a href="http://www.yiiframework.com/extension/yiidropbox/#hh1" rel="nofollow">http://www.yiiframework.com/extension/yiidropbox/#hh1</a> , I am getting the error  <code>include(OAuth.php): failed to open stream: No such file or directory</code>  . What is causing this error?</p>