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

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This exception has no message.
java.lang.NullPointerException	at org.openide.windows.OpenComponentAction.actionPerformed(OpenComponentAction.java:89)	at org.openide.awt.AlwaysEnabledAction$1.run(AlwaysEnabledAction.java:137)	at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:95)	at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:116)	at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:99)	at org.openide.awt.AlwaysEnabledAction.actionPerformed(AlwaysEnabledAction.java:140)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)	at javax.swing.AbstractButton.doClick(AbstractButton.java:376)	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877)	at java.awt.Component.processMouseEvent(Component.java:6437)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)	at java.awt.Component.processEvent(Component.java:6202)	at java.awt.Container.processEvent(Container.java:2213)	at java.awt.Component.dispatchEventImpl(Component.java:4793)	at java.awt.Container.dispatchEventImpl(Container.java:2271)	at java.awt.Component.dispatchEvent(Component.java:4619)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4816)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4476)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4406)	at java.awt.Container.dispatchEventImpl(Container.java:2257)	at java.awt.Window.dispatchEventImpl(Window.java:2677)	at java.awt.Component.dispatchEvent(Component.java:4619)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:662)	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:148)