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java.lang.NullPointerException: 	at com.cisco.dca.TableSorter.checkModel(TableSorter.java:146)	at com.cisco.dca.TableSorter.sort(TableSorter.java:152)	at com.cisco.dca.TableSorter.sortByColumn(TableSorter.java:201)	at com.cisco.dca.TableHeaderSorter.mouseClicked(TableSorter.java:231)	at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:212)	at java.awt.Component.processMouseEvent(Component.java:5504)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3135)	at java.awt.Component.processEvent(Component.java:5266)	at java.awt.Container.processEvent(Container.java:1966)	at java.awt.Component.dispatchEventImpl(Component.java:3968)	at java.awt.Container.dispatchEventImpl(Container.java:2024)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3901)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)	at java.awt.Container.dispatchEventImpl(Container.java:2010)	at java.awt.Window.dispatchEventImpl(Window.java:1778)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)