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

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java.lang.NullPointerException:
at org.netbeans.modules.j2ee.websphere6.ui.ServerProperties.updateInstanceInfo(ServerProperties.java:918)
at org.netbeans.modules.j2ee.websphere6.ui.ServerProperties.updateInstancesList(ServerProperties.java:906)
at org.netbeans.modules.j2ee.websphere6.ui.wizard.WSInstantiatingIterator.setServerRoot(WSInstantiatingIterator.java:193)
at org.netbeans.modules.j2ee.websphere6.ui.wizard.ServerLocationPanel.isValid(ServerLocationPanel.java:134)
at org.openide.WizardDescriptor.updateState(WizardDescriptor.java:623)
at org.netbeans.modules.j2ee.deployment.impl.ui.wizard.AddServerInstanceWizard.updateState(AddServerInstanceWizard.java:66)
at org.openide.WizardDescriptor.goToNextStep(WizardDescriptor.java:798)
at org.openide.WizardDescriptor.access$1000(WizardDescriptor.java:70)
at org.openide.WizardDescriptor$7.run(WizardDescriptor.java:1629)
at org.openide.WizardDescriptor.lazyValidate(WizardDescriptor.java:1161)
at org.openide.WizardDescriptor.access$1100(WizardDescriptor.java:70)
at org.openide.WizardDescriptor$Listener.actionPerformed(WizardDescriptor.java:1647)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:410)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.Dialog$1.run(Unknown Source)
at java.awt.Dialog.show(Unknown Source)
at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:810)
at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:853)
at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:841)
at org.openide.util.Mutex.doEventAccess(Mutex.java:1172)
at org.openide.util.Mutex.readAccess(Mutex.java:209)
at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:826)
at java.awt.Component.show(Unknown Source)
at java.awt.Component.setVisible(Unknown Source)
at org.netbeans.modules.j2ee.deployment.impl.ui.actions.AddServerInstanceAction.performAction(AddServerInstanceAction.java:36)
at org.openide.util.actions.NodeAction$3.run(NodeAction.java:531)
at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:47)
at org.openide.util.actions.NodeAction$DelegateAction.actionPerformed(NodeAction.java:527)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

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