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java.security.InvalidParameterException: 	at com.sun.java.help.search.DefaultSearchEngine.(DefaultSearchEngine.java:75)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)	at java.lang.reflect.Constructor.newInstance(Constructor.java:494)	at javax.help.search.MergingSearchEngine.makeEngine(MergingSearchEngine.java:169)	at javax.help.search.MergingSearchEngine.(MergingSearchEngine.java:63)	at javax.help.JHelpSearchNavigator.getSearchEngine(JHelpSearchNavigator.java:102)	at javax.help.plaf.basic.BasicSearchNavigatorUI$SearchActionListener.actionPerformed(BasicSearchNavigatorUI.java:109)	at javax.swing.JTextField.fireActionPerformed(JTextField.java:487)	at javax.swing.JTextField.postActionEvent(JTextField.java:668)	at javax.swing.JTextField$NotifyAction.actionPerformed(JTextField.java:783)	at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1571)	at javax.swing.JComponent.processKeyBinding(JComponent.java:2772)	at javax.swing.JComponent.processKeyBindings(JComponent.java:2807)	at javax.swing.JComponent.processKeyEvent(JComponent.java:2735)	at java.awt.Component.processEvent(Component.java:5294)	at java.awt.Container.processEvent(Container.java:1966)	at java.awt.Component.dispatchEventImpl(Component.java:3984)	at java.awt.Container.dispatchEventImpl(Container.java:2024)	at java.awt.Component.dispatchEvent(Component.java:3819)	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1826)	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:681)	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:938)	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:810)	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:645)	at java.awt.Component.dispatchEventImpl(Component.java:3857)	at java.awt.Container.dispatchEventImpl(Container.java:2024)	at java.awt.Window.dispatchEventImpl(Window.java:1791)	at java.awt.Component.dispatchEvent(Component.java:3819)	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)