gTalk connection error?

Hello again,

I got this error log when I tryed to login to gTalk server:

stream:error (text)
at org.jivesoftware.smack.PacketReader.parsePackets(PacketReader.java:306)
at org.jivesoftware.smack.PacketReader.access$000(PacketReader.java:44)
at org.jivesoftware.smack.PacketReader$1.run(PacketReader.java:76)
Sep 8, 2008 1:11:08 PM org.jivesoftware.spark.util.log.Log warning
WARNING: Exception in Login:
No response from the server.:
at org.jivesoftware.smack.NonSASLAuthentication.authenticate(NonSASLAuthentication .java:58)
at org.jivesoftware.smack.SASLAuthentication.authenticate(SASLAuthentication.java: 232)
at org.jivesoftware.smack.XMPPConnection.login(XMPPConnection.java:341)
at org.jivesoftware.LoginDialog$LoginPanel.login(LoginDialog.java:828)
at org.jivesoftware.LoginDialog$LoginPanel.access$400(LoginDialog.java:196)
at org.jivesoftware.LoginDialog$LoginPanel$1.construct(LoginDialog.java:594)
at org.jivesoftware.spark.util.SwingWorker$2.run(SwingWorker.java:129)
at java.lang.Thread.run(Unknown Source)

I have entered my username and password correctly, ‘talk.google.com’ as server name, and Spark gave me “Invalid username or password” error!

Does anybody know how to fix this problem???

Thanks