Google.Gdata.Clent.Service Retun Execution of authentication request returned unexpected result: 404

This below code is Returns "Execution of authentication request returned unexpected result: 404" Error when the execution coming to "feed = service.Query(query);" Line

Service service =newService("blogger","Example");
        service.Credentials=newGDataCredentials(username, password);GDataGAuthRequestFactory factory =(GDataGAuthRequestFactory)service.RequestFactory;
        factory.AccountType="GOOGLE";FeedQuery query =newFeedQuery();//Exception occurred in this line 
        query.Uri=newUri("http://www.blogger.com/feeds/default/blogs");AtomFeed feed =null;try{
            feed = service.Query(query);foreach(AtomEntry entry in feed.Entries){Console.WriteLine("Blog Title: "+ entry.Title.Text);}}catch(Exception ex){}