java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at ms_main.MS_Qry.getData(MS_Qry.java:28)
at ms_main.MS_Main_Table.ddSerch1ActionPerformed(MS_Main_Table.java:567)
at ms_main.MS_Main_Table.access$300(MS_Main_Table.java:12)
at ms_main.MS_Main_Table$4.actionPerformed(MS_Main_Table.java:352)
at javax.swing.JComboBox.fireActionEvent(JComboBox.java:1260)
at javax.swing.JComboBox.contentsChanged(JComboBox.java:1331)
at javax.swing.AbstractListModel.fireContentsChanged(AbstractListModel.java:118)
at javax.swing.DefaultComboBoxModel.setSelectedItem(DefaultComboBoxModel.java:93)
at javax.swing.DefaultComboBoxModel.addElement(DefaultComboBoxModel.java:131)
at javax.swing.JComboBox.addItem(JComboBox.java:718)
at ms_main.MS_Main_Table.comboLord(MS_Main_Table.java:39)
at ms_main.MS_Main_Table.(MS_Main_Table.java:24)
at ms_main.MS_Main_Table$6.run(MS_Main_Table.java:602)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

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