Hi,

I am getting this error when i try to open .xhtml files and also getting 
validation errors Unknown attribute (f)

Thanks in advance

java.lang.NoClassDefFoundError: org/jboss/tools/vpe/editor/IVEditor
  |     at java.lang.ClassLoader.defineClass1(Native Method)
  |     at java.lang.ClassLoader.defineClass(Unknown Source)
  |     at 
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:161)
  |     at 
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:501)
  |     at 
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:471)
  |     at 
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:430)
  |     at 
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:413)
  |     at 
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:189)
  |     at 
org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:340)
  |     at 
org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:408)
  |     at 
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:369)
  |     at 
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:357)
  |     at 
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:83)
  |     at java.lang.ClassLoader.loadClass(Unknown Source)
  |     at 
org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java:289)
  |     at 
org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:227)
  |     at 
org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1269)
  |     at 
org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:160)
  |     at 
org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:788)
  |     at 
org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
  |     at 
org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:51)
  |     at 
org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:244)
  |     at 
org.eclipse.ui.internal.registry.EditorDescriptor.createEditor(EditorDescriptor.java:231)
  |     at 
org.eclipse.ui.internal.EditorManager.createPart(EditorManager.java:841)
  |     at 
org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:606)
  |     at 
org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:426)
  |     at 
org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:592)
  |     at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:299)
  |     at 
org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:179)
  |     at 
org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:268)
  |     at 
org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
  |     at 
org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:400)
  |     at 
org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1256)
  |     at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1209)
  |     at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1604)
  |     at org.eclipse.ui.internal.PartStack.add(PartStack.java:499)
  |     at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:103)
  |     at org.eclipse.ui.internal.PartStack.add(PartStack.java:485)
  |     at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:112)
  |     at 
org.eclipse.ui.internal.EditorSashContainer.addEditor(EditorSashContainer.java:63)
  |     at 
org.eclipse.ui.internal.EditorAreaHelper.addToLayout(EditorAreaHelper.java:217)
  |     at 
org.eclipse.ui.internal.EditorAreaHelper.addEditor(EditorAreaHelper.java:207)
  |     at 
org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:774)
  |     at 
org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager.java:673)
  |     at 
org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:634)
  |     at 
org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2737)
  |     at 
org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2651)
  |     at 
org.eclipse.ui.internal.WorkbenchPage.access$13(WorkbenchPage.java:2643)
  |     at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2595)
  |     at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
  |     at 
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2590)
  |     at 
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2574)
  |     at 
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2565)
  |     at org.eclipse.ui.ide.IDE.openEditor(IDE.java:644)
  |     at org.eclipse.ui.ide.IDE.openEditor(IDE.java:603)
  |     at 
org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:286)
  |     at 
org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:139)
  |     at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:194)
  |     at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:175)
  |     at 
org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:268)
  |     at 
org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:244)
  |     at 
org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:316)
  |     at 
org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$5.open(PackageExplorerPart.java:613)
  |     at 
org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:820)
  |     at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
  |     at org.eclipse.core.runtime.Platform.run(Platform.java:857)
  |     at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:46)
  |     at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:199)
  |     at 
org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:818)
  |     at 
org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1079)
  |     at 
org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1183)
  |     at 
org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:263)
  |     at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:257)
  |     at 
org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:297)
  |     at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
  |     at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)
  |     at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682)
  |     at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293)
  |     at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)
  |     at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)
  |     at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)
  |     at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)
  |     at 
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)
  |     at 
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)
  |     at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
  |     at 
org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)
  |     at 
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)
  |     at 
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
  |     at 
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
  |     at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
  |     at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
  |     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  |     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  |     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  |     at java.lang.reflect.Method.invoke(Unknown Source)
  |     at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)
  |     at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)
  |     at org.eclipse.equinox.launcher.Main.run(Main.java:1173)
  | 


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