JMSN

I was download jmsn-0.9.9b2 and run in win/xp environment and java2 1.5 when the login massege was apper to "username or password incorrect" after i was download new jsmn.jar file then run the project at that tim thron exception in below

Exception in thread "AWT-EventQueue-0" java.lang.NoSuchMethodError: rath.msnm.entity.MsnFriend.setGroupIndex(I)V
at rath.jmsn.BuddyTree.start(BuddyTree.java:217)
at rath.jmsn.BuddyTree$Listener$2.run(BuddyTree.java:618)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
after i was downloaded msnmlib but I dont know hot use it with jmsn-0.9.9b2 and how to fix above error. my login name and password is ok.

PLEASE HELP ME SOLVE TO MY PROBLEM. If any one help me i appreciate that thing.

thank you