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Create a new RCP project based on the "with a view" template and try to open View.java in WindowBuilder. You receive the following stacktrace: org.eclipse.wb.internal.core.utils.exception.DesignerException: 103 (Unknown GUI toolkit). testing.View at org.eclipse.wb.internal.core.parser.JavaInfoParser.prepareParseContext(JavaInfoParser.java:1198) at org.eclipse.wb.internal.core.parser.JavaInfoParser.parse(JavaInfoParser.java:244) at org.eclipse.wb.internal.core.parser.JavaInfoParser.access$9(JavaInfoParser.java:240) at org.eclipse.wb.internal.core.parser.JavaInfoParser$1.runObject(JavaInfoParser.java:153) at org.eclipse.wb.internal.core.parser.JavaInfoParser$1.runObject(JavaInfoParser.java:1) at org.eclipse.wb.internal.core.utils.execution.ExecutionUtils.runDesignTime(ExecutionUtils.java:153) at org.eclipse.wb.internal.core.parser.JavaInfoParser.parse(JavaInfoParser.java:151) at org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:513) at org.eclipse.wb.internal.core.editor.DesignPage.access$9(DesignPage.java:501) at org.eclipse.wb.internal.core.editor.DesignPage$8$1.run(DesignPage.java:434) at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180) at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150) at org.eclipse.swt.widgets.Display.syncExec(Display.java:4683) at org.eclipse.wb.internal.core.editor.DesignPage$8.run(DesignPage.java:431) 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 org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF_withProgress(DesignPage.java:450) at org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:400) at org.eclipse.wb.internal.core.editor.UndoManager.refreshDesignerEditor(UndoManager.java:381) at org.eclipse.wb.internal.core.editor.DesignPage.refreshGEF(DesignPage.java:377) at org.eclipse.wb.internal.core.editor.actions.RefreshAction.run(RefreshAction.java:46) at org.eclipse.wb.internal.core.editor.actions.DesignPageAction.run(DesignPageAction.java:34) at org.eclipse.wb.internal.core.editor.errors.JavaExceptionComposite.doRefresh(JavaExceptionComposite.java:87) at org.eclipse.wb.internal.core.editor.errors.ExceptionComposite$3.widgetSelected(ExceptionComposite.java:129) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) 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:344) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) 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:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) at org.eclipse.equinox.launcher.Main.main(Main.java:1386) Full context stack trace: org.eclipse.wb.internal.core.utils.exception.DesignerException: 103 (Unknown GUI toolkit). testing.View at org.eclipse.wb.internal.core.parser.JavaInfoParser.prepareParseContext(JavaInfoParser.java:1198) at org.eclipse.wb.internal.core.parser.JavaInfoParser.parse(JavaInfoParser.java:244) at org.eclipse.wb.internal.core.parser.JavaInfoParser.access$9(JavaInfoParser.java:240) at org.eclipse.wb.internal.core.parser.JavaInfoParser$1.runObject(JavaInfoParser.java:153) at org.eclipse.wb.internal.core.parser.JavaInfoParser$1.runObject(JavaInfoParser.java:1) at org.eclipse.wb.internal.core.utils.execution.ExecutionUtils.runDesignTime(ExecutionUtils.java:153) at org.eclipse.wb.internal.core.parser.JavaInfoParser.parse(JavaInfoParser.java:151) at org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:513) at org.eclipse.wb.internal.core.editor.DesignPage.access$9(DesignPage.java:501) at org.eclipse.wb.internal.core.editor.DesignPage$8$1.run(DesignPage.java:434) at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180) at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150) at org.eclipse.swt.widgets.Display.syncExec(Display.java:4683) at org.eclipse.wb.internal.core.editor.DesignPage$8.run(DesignPage.java:431) 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 org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF_withProgress(DesignPage.java:450) at org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:400) at org.eclipse.wb.internal.core.editor.UndoManager.refreshDesignerEditor(UndoManager.java:381) at org.eclipse.wb.internal.core.editor.DesignPage.refreshGEF(DesignPage.java:377) at org.eclipse.wb.internal.core.editor.actions.RefreshAction.run(RefreshAction.java:46) at org.eclipse.wb.internal.core.editor.actions.DesignPageAction.run(DesignPageAction.java:34) at org.eclipse.wb.internal.core.editor.errors.JavaExceptionComposite.doRefresh(JavaExceptionComposite.java:87) at org.eclipse.wb.internal.core.editor.errors.ExceptionComposite$3.widgetSelected(ExceptionComposite.java:129) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) 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:344) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) 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:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
I used the Indigo update site and only installed all package s with "WindowBuilder". I missed installing the SWT Designer.After installing SWT Designer everything works again. Sorry for this message.