ClassCastException Kelp5 in SunOneStudio on RedHat 8

  I get the following message when creating a new Enhydra Application:
Thu Nov 14 22:20:13 CET 2002: java.lang.ClassCastException: Posted 
StackTrace
Annotation: Exception occurred in Request Processor
org.openide.util.RequestProcessor$Holder: Posted StackTrace(task 
org.netbeans.core.ModuleActions$1@e2c931 [-29356, 1, -1])
at 
org.openide.util.RequestProcessor$Holder.fillInStackTrace(RequestProcessor.java:300)
at java.lang.Throwable.<init>(Throwable.java:195)
at java.lang.Exception.<init>(Exception.java:41)
at 
org.openide.util.RequestProcessor$Holder.<init>(RequestProcessor.java:280)
at 
org.openide.util.RequestProcessor$Task.createHolder(RequestProcessor.java:333)
at org.openide.util.RequestProcessor.post(RequestProcessor.java:100)
at org.openide.util.RequestProcessor.post(RequestProcessor.java:73)
at org.netbeans.core.ModuleActions.invokeAction(ModuleActions.java:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.openide.awt.Actions.invokeAction(Actions.java:446)
at org.openide.awt.Actions$ButtonBridge.actionPerformed(Actions.java:425)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1764)
at 
javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1817)
at 
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:419)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:257)
at javax.swing.AbstractButton.doClick(AbstractButton.java:289)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1109)
[catch] at 
javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(BasicMenuItemUI.java:943)
at java.awt.Component.processMouseEvent(Component.java:5093)
at java.awt.Component.processEvent(Component.java:4890)
at java.awt.Container.processEvent(Container.java:1566)
at java.awt.Component.dispatchEventImpl(Component.java:3598)
at java.awt.Container.dispatchEventImpl(Container.java:1623)
at java.awt.Component.dispatchEvent(Component.java:3439)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3165)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)
at java.awt.Container.dispatchEventImpl(Container.java:1609)
at java.awt.Window.dispatchEventImpl(Window.java:1585)
at java.awt.Component.dispatchEvent(Component.java:3439)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)
at 
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
Thu Nov 14 22:20:13 CET 2002: java.lang.ClassCastException: <no message>
java.lang.ClassCastException
at org.enhydra.kelp.forte.node.ForteDocumentNode.setProperty(Unknown Source)
at org.enhydra.kelp.forte.node.ForteDocumentNode.setSelected(Unknown Source)
at org.enhydra.kelp.common.importer.ImportTool.setupDocumentNode(Unknown 
Source)
at org.enhydra.kelp.common.importer.ImportTool.addFiles(Unknown Source)
at org.enhydra.kelp.common.importer.ImportTool.privateImport(Unknown Source)
at org.enhydra.kelp.common.importer.ImportTool.importFiles(Unknown Source)
at org.enhydra.kelp.common.codegen.ProjectGenUtil.importFiles(Unknown 
Source)
at org.enhydra.kelp.forte.actions.AppWizardAction.performAction(Unknown 
Source)
at 
org.openide.util.actions.CallableSystemAction.actionPerformed(CallableSystemAction.java:69)
at org.netbeans.core.ModuleActions$1.run(ModuleActions.java:105)
at org.openide.util.Task.run(Task.java:152)
[catch] at 
org.openide.util.RequestProcessor$ProcessorThread.run(RequestProcessor.java:622)

Can someone tell me whats' wrong?

regards,

Jacob Willig