Startup error after installing SKOSed

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after installing SKOSEd-2.0-alpha(build 38) on Windows XP Protege doesn't start 
up but returns:

Error 1 Logged at Mon Sep 26 16:10:36 CEST 2011
UnsupportedClassVersionError: Bad version number in .class file
    java.lang.ClassLoader.defineClass1(Native Method)
    java.lang.ClassLoader.defineClass(Unknown Source)
    org.apache.felix.framework.ModuleImpl$ModuleClassLoader.findClass(ModuleImpl.java:1872)
    org.apache.felix.framework.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:758)
    org.apache.felix.framework.ModuleImpl.access$100(ModuleImpl.java:61)
    org.apache.felix.framework.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1733)
    java.lang.ClassLoader.loadClass(Unknown Source)
    org.apache.felix.framework.ModuleImpl.getClassByDelegation(ModuleImpl.java:674)
    org.apache.felix.framework.Felix.loadBundleClass(Felix.java:1543)
    org.apache.felix.framework.BundleImpl.loadClass(BundleImpl.java:887)
    org.protege.editor.core.plugin.PluginUtilities.getExtensionObject(PluginUtilities.java:131)
    org.protege.editor.core.plugin.ExtensionInstantiator.instantiate(ExtensionInstantiator.java:74)
    org.protege.editor.core.plugin.AbstractProtegePlugin.newInstance(AbstractProtegePlugin.java:32)
    org.protege.editor.core.ui.menu.MenuActionPluginJPFImpl.newInstance(MenuActionPluginJPFImpl.java:148)
    org.protege.editor.core.ui.menu.MenuActionPluginJPFImpl.newInstance(MenuActionPluginJPFImpl.java:31)
    org.protege.editor.core.ui.menu.MenuBuilder.buildInnerMenu(MenuBuilder.java:139)
    org.protege.editor.core.ui.menu.MenuBuilder.addMenu(MenuBuilder.java:94)
    org.protege.editor.core.ui.menu.MenuBuilder.buildCompositeMenu(MenuBuilder.java:114)
    org.protege.editor.core.ui.menu.MenuBuilder.addMenu(MenuBuilder.java:88)
    org.protege.editor.core.ui.menu.MenuBuilder.buildMenu(MenuBuilder.java:77)
    org.protege.editor.core.ui.workspace.WorkspaceFrame.createMenuBar(WorkspaceFrame.java:190)
    org.protege.editor.core.ui.workspace.WorkspaceFrame.createUI(WorkspaceFrame.java:160)
    org.protege.editor.core.ui.workspace.WorkspaceFrame.<init>(WorkspaceFrame.java:78)
    org.protege.editor.core.ui.workspace.WorkspaceManager.addWorkspace(WorkspaceManager.java:37)
    org.protege.editor.core.editorkit.EditorKitManager.addEditorKit(EditorKitManager.java:46)
    org.protege.editor.core.ProtegeManager.createAndSetupNewEditorKit(ProtegeManager.java:130)
    org.protege.editor.core.ProtegeWelcomeFrame$ProtegeWelcomePanel$1.actionPerformed(ProtegeWelcomeFrame.java:122)
    org.protege.editor.core.ui.util.LinkLabel.activateLink(LinkLabel.java:102)
    org.protege.editor.core.ui.util.LinkLabel.access$100(LinkLabel.java:30)
    org.protege.editor.core.ui.util.LinkLabel$1.mouseReleased(LinkLabel.java:68)
    java.awt.Component.processMouseEvent(Unknown Source)
    javax.swing.JComponent.processMouseEvent(Unknown Source)
    java.awt.Component.processEvent(Unknown Source)
    java.awt.Container.processEvent(Unknown Source)
    java.awt.Component.dispatchEventImpl(Unknown Source)
    java.awt.Container.dispatchEventImpl(Unknown Source)
    java.awt.Component.dispatchEvent(Unknown Source)
    java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    java.awt.Container.dispatchEventImpl(Unknown Source)
    java.awt.Window.dispatchEventImpl(Unknown Source)
    java.awt.Component.dispatchEvent(Unknown Source)
    java.awt.EventQueue.dispatchEvent(Unknown Source)
    java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
    java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    java.awt.EventDispatchThread.run(Unknown Source)

Using the one day older 2.0 version Protege does start up but trying to check  
the skos editor tab in the tabs menu produces a comparable error:

Error 1 Logged at Mon Sep 26 16:07:28 CEST 2011
UnsupportedClassVersionError: Bad version number in .class file
    java.lang.ClassLoader.defineClass1(Native Method)
    java.lang.ClassLoader.defineClass(Unknown Source)
    org.apache.felix.framework.ModuleImpl$ModuleClassLoader.findClass(ModuleImpl.java:1872)
    org.apache.felix.framework.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:758)
    org.apache.felix.framework.ModuleImpl.access$100(ModuleImpl.java:61)
    org.apache.felix.framework.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1733)
    java.lang.ClassLoader.loadClass(Unknown Source)
    org.apache.felix.framework.ModuleImpl.getClassByDelegation(ModuleImpl.java:674)
    org.apache.felix.framework.Felix.loadBundleClass(Felix.java:1543)
    org.apache.felix.framework.BundleImpl.loadClass(BundleImpl.java:887)
    org.protege.editor.core.plugin.PluginUtilities.getExtensionObject(PluginUtilities.java:131)
    org.protege.editor.core.plugin.ExtensionInstantiator.instantiate(ExtensionInstantiator.java:74)
    org.protege.editor.core.ui.workspace.WorkspaceTabPluginJPFImpl.newInstance(WorkspaceTabPluginJPFImpl.java:99)
    org.protege.editor.core.ui.workspace.WorkspaceTabPluginJPFImpl.newInstance(WorkspaceTabPluginJPFImpl.java:30)
    org.protege.editor.core.ui.workspace.tabs.TabsMenuAction$1.actionPerformed(TabsMenuAction.java:50)
    javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    javax.swing.JToggleButton$ToggleButtonModel.setPressed(Unknown Source)
    javax.swing.AbstractButton.doClick(Unknown Source)
    javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
    javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
    java.awt.Component.processMouseEvent(Unknown Source)
    javax.swing.JComponent.processMouseEvent(Unknown Source)
    java.awt.Component.processEvent(Unknown Source)
    java.awt.Container.processEvent(Unknown Source)
    java.awt.Component.dispatchEventImpl(Unknown Source)
    java.awt.Container.dispatchEventImpl(Unknown Source)
    java.awt.Component.dispatchEvent(Unknown Source)
    java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    java.awt.Container.dispatchEventImpl(Unknown Source)
    java.awt.Window.dispatchEventImpl(Unknown Source)
    java.awt.Component.dispatchEvent(Unknown Source)
    java.awt.EventQueue.dispatchEvent(Unknown Source)
    java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
    java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    java.awt.EventDispatchThread.run(Unknown Source)

Seems different form issue 9 so I decided to let you know

Original issue reported on code.google.com by henk.mat...@kb.nl on 26 Sep 2011 at 2:27