Android : how can i purchase in app billing version3 android?

I am new to the inappbilling integration for android.I am using the develop the following link

http://developer.android.com/training/in-app-billing/preparing-iab-app.html#GetSample

and also TrivialDrive import my eclipse and generate to the apk and export apk in googleplaystoreconsole of drafts not in published and also created to the product item and put in product id to my activity and

add to the String base64EncodedPublicKey="RSA public key". finally run the code showing following screen

also ways showing this screen .i didn't understand what is going on rightnow.please help me anyone known and idea about this advance thaks to all.