Error when get list account from google analytics

Question

Hi every body..

I want to get list  Account from google analytics but i don't can.. 

here is my code

// Configure GA API.

      AnalyticsService asv = new AnalyticsService("gaExportAPI_acctSample_v3.0");

      // Client Login Authorization.

      asv.setUserCredentials(CLIENT_USERNAME, CLIENT_PASS);

      // GA Account Feed query uri.

      AccountQuery query = new AccountQuery();

      // Send our request to the Analytics API and wait for the results to

      // come back.

      AccountFeed accountFeed = asv.Query(query);  (Error here)

Error: "Authentication failed: execution of request failed http:://google.com/analytics/feeds/accounts/default"

Help me, Please..