Hi, I done shopping with ubercart defalut checkout and test payment method .Its working fine. To test google checkout I made changes in configuartion checkout settings and disabled defalut check out button of ubercart. I am getting Google Check Out button as shown in attached pic. When I click on it its showing me "The website cannot display the page".

I have saved the settings in Google Check Out settings page also.( Merchant ID and Merchant Key ). Saved http://xyz.com/google_checkout in callback API of google check out page . Still its giving me this error. Whats wrong with this?