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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)