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java.lang.ArrayIndexOutOfBoundsException: -1	at java.util.Vector.elementAt(Unknown Source)	at javax.swing.DefaultListModel.getElementAt(Unknown Source)	at org.jivesoftware.spark.ui.ContactGroup$ListMotionListener.mouseMoved(	at org.jivesoftware.spark.ui.ContactGroup$4.actionPerformed(	at javax.swing.Timer.fireActionPerformed(Unknown Source)	at javax.swing.Timer$ Source)	at java.awt.event.InvocationEvent.dispatch(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at Source)