title: Google Drive getToken class not found exception
body: <p>I have integrated Google Drive in my android app and when I debug the app on the device with the android version 2.3.6 I get ClassNotFoundException when I call this:</p>
  
  <pre><code>mCredential.getToken();
  </code></pre>
  
  <p>where mCredential is set like that:</p>
  
  <pre><code>mCredential = GoogleAccountCredential.usingOAuth2(context, DriveScopes.DRIVE);
  </code></pre>
  
  <p>I see that in my Debug tab:</p>
  
  <pre><code>Thread [&lt;13&gt; Thread-15] (Suspended (exception ClassNotFoundException))  
  &lt;VM does not provide monitor information&gt;   
  PathClassLoader.findClass(String) line: 240 
  PathClassLoader(ClassLoader).loadClass(String, boolean) line: 551   
  PathClassLoader(ClassLoader).loadClass(String) line: 511    
  GoogleAuthUtil.f(Context) line: not available   
  GoogleAuthUtil.getToken(Context, String, String, Bundle) line: not available    
  GoogleAuthUtil.getToken(Context, String, String) line: not available    
  GoogleAccountCredential.getToken() line: 192    
  GoogleDrive.checkIfUserIsAuthenticated(Activity, boolean) line: 411 
  GoogleDrive.access$4(GoogleDrive, Activity, boolean) line: 403  
  GoogleDrive$1.run() line: 98
  </code></pre>
  
  <p>Can someone help me?</p>