java.lang.Error: java.beans.IntrospectionException: Method "actionPerformed" should have argument "Action PerformedEvent"

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java.beans.IntrospectionException: Method "actionPerformed" should have argument "Action PerformedEvent"
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java.beans.IntrospectionException: Method "actionPerformed" should have argument "ActionPerformedEvent"
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java.beans.IntrospectionException: Method "actionPerformed" sho uld have argument "ActionPerformedEvent"
java.lang.Error: java.beans.IntrospectionException: Method "actionPerformed" should have argument "Action
PerformedEvent"	at sunw.demo.buttons.ExplicitButtonBeanInfo.getEventSetDescriptors(ExplicitButtonBeanInfo.java:60)	at java.beans.Introspector.getTargetEventInfo(Unknown Source)	at java.beans.Introspector.getBeanInfo(Unknown Source)	at java.beans.Introspector.getBeanInfo(Unknown Source)	at sun.beanbox.JarInfo.(JarInfo.java:66)	at sun.beanbox.JarLoader.createJarInfo(JarLoader.java:292)	at sun.beanbox.JarLoader.loadJar(JarLoader.java:197)	at sun.beanbox.JarLoader.loadJarDoOnBean(JarLoader.java:207)	at sun.beanbox.ToolBoxPanel.addBeansInJar(ToolBox.java:175)	at sun.beanbox.ToolBoxPanel.(ToolBox.java:105)	at sun.beanbox.ToolBoxScrollPane.(ToolBox.java:69)	at sun.beanbox.ToolBox.(ToolBox.java:28)	at sun.beanbox.BeanBoxFrame.(BeanBoxFrame.java:124)	at sun.beanbox.BeanBoxFrame.main(BeanBoxFrame.java:91)