No response from the server : Gtalk when i try to add contact

Hello,

When i try to add new contact in my Gtalk contact list i am getting this exception from smack : No response from the server :

Roster roster = xmppClient.connection.getRoster();
                        roster.createEntry(addedContactUsername, displayName, null);

Do you have any idea ? This code was working perfectly last month. Are there any problem in Gtalk’s roster management ???

Best Regards,

Alper.