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

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at ms_main.MS_Qry.getData(
at ms_main.MS_Main_Table.ddSerch1ActionPerformed(
at ms_main.MS_Main_Table.access$300(
at ms_main.MS_Main_Table$4.actionPerformed(
at javax.swing.JComboBox.fireActionEvent(
at javax.swing.JComboBox.contentsChanged(
at javax.swing.AbstractListModel.fireContentsChanged(
at javax.swing.DefaultComboBoxModel.setSelectedItem(
at javax.swing.DefaultComboBoxModel.addElement(
at javax.swing.JComboBox.addItem(
at ms_main.MS_Main_Table.comboLord(
at ms_main.MS_Main_Table.(
at ms_main.MS_Main_Table$
at java.awt.event.InvocationEvent.dispatch(
at java.awt.EventQueue.dispatchEventImpl(
at java.awt.EventQueue.access$200(
at java.awt.EventQueue$
at java.awt.EventQueue$
at Method)
at java.awt.EventQueue.dispatchEvent(
at java.awt.EventDispatchThread.pumpOneEventForFilters(
at java.awt.EventDispatchThread.pumpEventsForFilter(
at java.awt.EventDispatchThread.pumpEventsForHierarchy(
at java.awt.EventDispatchThread.pumpEvents(
at java.awt.EventDispatchThread.pumpEvents(

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