[jdev] add, del contact from gateway

[Bruno Bechler Machado]

Hy,
i'm tryng to add a contact to my msn account using this code:

public void addContact(XMPPConnection connection, String contact, String
gatewayName)
{
 Roster roster = connection.getRoster();
        String absoluteFriend = contact + "@" + gatewayName + "." +
connection.getServiceName();


        roster.createEntry(absoluteFriend, contact, new String[]
{"group1"});
}

but i'm having a problem, and i dont know how to solve, example:


addContact(xMPPConnection, "test at hotmail.com", "msn");

Error at the console:
<iq id="9F0m8-4" to="thisUser at myservice/Smack" type="error"><query
xmlns="jabber:iq:roster"><item jid="test at hotmail.com@msn.myservice" name="
test at hotmail.com"><group>group1</group></item></query><errorcode="400"></error></iq>
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