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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)