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

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This exception has no message.
java.lang.NullPointerException:
at java.awt.dnd.DropTarget.addNotify(DropTarget.java:454)
at java.awt.Component.addNotify(Component.java:5271)
at java.awt.Container.addNotify(Container.java:1949)
at javax.swing.JComponent.addNotify(JComponent.java:4141)
at java.awt.Container.addNotify(Container.java:1957)
at javax.swing.JComponent.addNotify(JComponent.java:4141)
at java.awt.Container.addNotify(Container.java:1957)
at javax.swing.JComponent.addNotify(JComponent.java:4141)
at java.awt.Container.addImpl(Container.java:486)
at java.awt.Container.add(Container.java:368)
at org.netbeans.core.ui.ModuleSelectionPanel.initComponents(ModuleSelectionPanel.java:145)
at org.netbeans.core.ui.ModuleSelectionPanel.addNotify(ModuleSelectionPanel.java:74)
at org.netbeans.core.ui.ModuleSelectionPanel.readSettings(ModuleSelectionPanel.java:221)
at org.openide.WizardDescriptor.updateState(WizardDescriptor.java:450)
at org.netbeans.core.ui.SetupWizard$InitializedWizardDescriptor.updateState(SetupWizard.java:403)
at org.openide.WizardDescriptor$Listener.actionPerformed(WizardDescriptor.java:948)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1722)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1775)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:414)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:253)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:261)
at java.awt.Component.processMouseEvent(Component.java:4906)
at java.awt.Component.processEvent(Component.java:4732)
at java.awt.Container.processEvent(Container.java:1337)
at java.awt.Component.dispatchEventImpl(Component.java:3476)
at java.awt.Container.dispatchEventImpl(Container.java:1399)
at java.awt.Component.dispatchEvent(Component.java:3343)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3302)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3014)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2967)
at java.awt.Container.dispatchEventImpl(Container.java:1373)
at java.awt.Window.dispatchEventImpl(Window.java:1459)
at java.awt.Component.dispatchEvent(Component.java:3343)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:439)
at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:131)
at java.awt.Dialog.show(Dialog.java:498)
at org.netbeans.core.NbPresenter.superShow(NbPresenter.java:672)
at org.netbeans.core.NbPresenter.run(NbPresenter.java:695)
at org.openide.util.Mutex.doEventAccess(Mutex.java:917)
at org.openide.util.Mutex.readAccess(Mutex.java:162)
at org.netbeans.core.NbPresenter.show(NbPresenter.java:676)
at org.netbeans.core.ui.SetupWizard.show(SetupWizard.java:287)
at org.netbeans.core.ui.SetupWizard.showSetupWizard(SetupWizard.java:364)
at org.netbeans.core.NonGui$2.run(NonGui.java:555)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:160)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:437)
at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:131)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)

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