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java.lang.NullPointerException: 	at FTPClient.JTreeWithFTP.valueChanged(JTreeWithFTP.java:808)	at javax.swing.JTree.fireValueChanged(JTree.java:2820)	at javax.swing.JTree$TreeSelectionRedirector.valueChanged(JTree.java:3191)	at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629)	at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1078)	at javax.swing.tree.DefaultTreeSelectionModel.removeSelectionPaths(DefaultTreeSelectionModel.java:497)	at javax.swing.JTree.removeDescendantSelectedPaths(JTree.java:3516)	at javax.swing.JTree.setExpandedState(JTree.java:3404)	at javax.swing.JTree.collapsePath(JTree.java:2188)	at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2215)	at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2191)	at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2149)	at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3511)	at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3459)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262)	at java.awt.Component.processMouseEvent(Component.java:6286)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)	at java.awt.Component.processEvent(Component.java:6054)	at java.awt.Container.processEvent(Container.java:2041)	at java.awt.Component.dispatchEventImpl(Component.java:4652)	at java.awt.Container.dispatchEventImpl(Container.java:2099)	at java.awt.Component.dispatchEvent(Component.java:4482)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4235)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)	at java.awt.Container.dispatchEventImpl(Container.java:2085)	at java.awt.Window.dispatchEventImpl(Window.java:2478)	at java.awt.Component.dispatchEvent(Component.java:4482)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644)	at java.awt.EventQueue.access$000(EventQueue.java:85)	at java.awt.EventQueue$1.run(EventQueue.java:603)	at java.awt.EventQueue$1.run(EventQueue.java:601)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)	at java.awt.EventQueue$2.run(EventQueue.java:617)	at java.awt.EventQueue$2.run(EventQueue.java:615)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:614)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)