GWT DESIGNER NOT WORKING WITH GWT SDK 2.0.4

GoodMorning, i'm a new GWT user, i installed gwt and GWT designer as
eclipse plugins. But when i tried to pass in design mode with the
WIndowBuilder Editor, i obtain the following error:

java.lang.NoClassDefFoundError: Could not initialize class
com.google.gwt.dev.shell.ie.util.Utils
at
com.instantiations.designer.gwt.hosted.ie.BrowserShellIE6.<init>(BrowserShellIE6.java:
63)
at
com.instantiations.designer.gwt.hosted.ie.BrowserShellFactory.create(BrowserShellFactory.java:
13)
at
com.instantiations.designer.gwt.hosted.tdz.HostedModeSupport.createBrowserShell(HostedModeSupport.java:
212)
at
com.instantiations.designer.gwt.hosted.tdz.HostedModeSupport.<init>(HostedModeSupport.java:
73)
at
com.instantiations.designer.gwt.hosted.tdz.HostedModeSupportFactory.create(HostedModeSupportFactory.java:
17)
at
com.instantiations.designer.gwt.model.widgets.support.GWTState.getHostedModeSupport(GWTState.java:
899)
at
com.instantiations.designer.gwt.model.widgets.support.GWTState.initialize(GWTState.java:
196)
at
com.instantiations.designer.gwt.model.widgets.support.GWTState.<init>(GWTState.java:
175)
at
com.instantiations.designer.gwt.model.widgets.support.GWTState.<init>(GWTState.java:
102)
at
com.instantiations.designer.gwt.parser.ParseFactory.getClassLoader(ParseFactory.java:
371)
at
com.instantiations.designer.core.parser.AbstractParseFactory.initializeClassLoader(AbstractParseFactory.java:
695)
at
com.instantiations.designer.gwt.parser.ParseFactory.getRootContext(ParseFactory.java:
89)
at
com.instantiations.designer.core.parser.JavaInfoParser.prepareParseContext(JavaInfoParser.java:
1091)
at
com.instantiations.designer.core.parser.JavaInfoParser.parse(JavaInfoParser.java:
220)
at com.instantiations.designer.core.parser.JavaInfoParser.access
$9(JavaInfoParser.java:216)
at com.instantiations.designer.core.parser.JavaInfoParser
$1.runObject(JavaInfoParser.java:137)
at com.instantiations.designer.core.parser.JavaInfoParser
$1.runObject(JavaInfoParser.java:1)
at
com.instantiations.designer.core.utils.execution.ExecutionUtils.runDesignTime(ExecutionUtils.java:
133)
at
com.instantiations.designer.core.parser.JavaInfoParser.parse(JavaInfoParser.java:
135)
at
com.instantiations.designer.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:
408)
at com.instantiations.designer.core.editor.DesignPage.access
$10(DesignPage.java:400)
at com.instantiations.designer.core.editor.DesignPage
$7$1.run(DesignPage.java:337)
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:
179)
at
org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:
150)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4342)
at com.instantiations.designer.core.editor.DesignPage
$7.run(DesignPage.java:334)
at
org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:
464)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:
372)
at
org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:
507)
at
com.instantiations.designer.core.editor.DesignPage.internal_refreshGEF_withProgress(DesignPage.java:
355)
at
com.instantiations.designer.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:
304)
at
com.instantiations.designer.core.editor.UndoManager.refreshDesignerEditor(UndoManager.java:
362)
at
com.instantiations.designer.core.editor.DesignPage.refreshGEF(DesignPage.java:
290)
at
com.instantiations.designer.core.editor.actions.RefreshAction.run(RefreshAction.java:
34)
at
com.instantiations.designer.core.editor.actions.DesignPageAction.run(DesignPageAction.java:
23)
at
com.instantiations.designer.core.editor.errors.ExceptionCompositeJava.doRefresh(ExceptionCompositeJava.java:
77)
at com.instantiations.designer.core.editor.errors.ExceptionComposite
$2.widgetSelected(ExceptionComposite.java:101)
at
org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:
228)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:
3910)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3503)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:
2405)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:
332)
at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:
493)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:
149)
at
org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:
113)
at
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:
194)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:
110)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:
79)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:
368)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:
179)
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:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)

MAYBE I'M NOT IN THE RIGHT SECTION; I'M SORRY BUT I'M NEW TO THE FORUM

THANKS IN ADVANCE FOR HELP

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