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..