Track down unknown exception thrown by Assembler

[ghost]

While running the Assembler, it throws this exception (but does not crash):

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 3 >= 0 at java.util.Vector.elementAt(Vector.java:427) at HackGUI.TextFileComponent$TextFileTableModel.getValueAt(Unknown Source) at javax.swing.JTable.getValueAt(JTable.java:2686) at javax.swing.JTable.prepareRenderer(JTable.java:5703) at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2072) at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:1974) at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:1770) at javax.swing.plaf.ComponentUI.update(ComponentUI.java:153) at javax.swing.JComponent.paintComponent(JComponent.java:752) at javax.swing.JComponent.paint(JComponent.java:1029) at javax.swing.JComponent._paintImmediately(JComponent.java:5098) at javax.swing.JComponent.paintImmediately(JComponent.java:4882) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:811) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:713) at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:693) at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:125) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:633) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)