title: "An internal error occurred" with integration of Google Plus Login
body: <p>I am trying to integrate a Google plus Login in my application as per the instruction provided by following link :
  <a href="https://developers.google.com/+/quickstart/android#install-sdk">https://developers.google.com/+/quickstart/android#install-sdk</a></p>
  
  <p>I am following all the instructions perfectly.  And when I run the sample application on a real device provided in the android-sdk and click the <code>signin</code> button, it display a Toast message that <code>An internal error occurred</code></p>
  
  <p>What am I doing wrong?</p>