title: GooglePlayServices not available due to error 9
body: <p>I'm trying to run the GooglePlayServices samples but on the Auth sample I get the following error when pressing the Greet Me button:</p>
  
  <p>com.google.android.gms.auth.GoogleAuthException: GooglePlayServices not available due to error 9</p>
  
  <p>and Signature not valid. Found XXXX</p>
  
  <p>the error is on the call 
  GoogleAuthUtil.getToken(mActivity, mEmail, mScope);</p>
  
  <p>I didn't do anything else, just compile and run the sample.</p>
  
  <p>I do have the Google Play Services installed on my device. </p>
  
  <p>Am I missing something?</p>
  
  <p>Thanks</p>