Eclipse does not show workspace to write code on - eclipse

Question

i get the followng error when i create a new class. No code can be typed into the space, how can i fix this
An error has occurred. See error log for more details.
org.eclipse.swt.custom.StyledText.getScrollbarsMode()I
the error log is as follows;
Message;Unhandled event loop exception java.lang.NoSuchMethodError:
org.eclipse.swt.custom.StyledText.getScrollbarsMode()I at
org.eclipse.jface.text.source.SourceViewer$RulerLayout.layout(SourceViewer.java:130)
at
org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1263)
at
org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1249)
at org.eclipse.swt.widgets.Composite.layout(Composite.java:664) at
org.eclipse.swt.widgets.Composite.layout(Composite.java:622) at
org.eclipse.jface.text.source.CompositeRuler.layoutTextViewer(CompositeRuler.java:611)
at
org.eclipse.jface.text.source.CompositeRuler.addDecorator(CompositeRuler.java:565)
at
org.eclipse.jface.text.source.SourceViewer.addVerticalRulerColumn(SourceViewer.java:1194)
at
org.eclipse.jface.text.source.projection.ProjectionSupport.doEnableProjection(ProjectionSupport.java:311)
at
org.eclipse.jface.text.source.projection.ProjectionSupport$ProjectionListener.projectionEnabled(ProjectionSupport.java:143)
at
org.eclipse.jface.text.source.projection.ProjectionViewer.fireProjectionEnabled(ProjectionViewer.java:487)
at
org.eclipse.jface.text.source.projection.ProjectionViewer.enableProjection(ProjectionViewer.java:535)
at
org.eclipse.jdt.internal.ui.javaeditor.JavaSourceViewer.setVisibleDocument(JavaSourceViewer.java:676)
at
org.eclipse.jface.text.TextViewer.setDocument(TextViewer.java:2938)
at
org.eclipse.jface.text.source.SourceViewer.setDocument(SourceViewer.java:642)
at
org.eclipse.jface.text.source.projection.ProjectionViewer.setDocument(ProjectionViewer.java:374)
at
org.eclipse.jface.text.source.SourceViewer.setDocument(SourceViewer.java:590)
at
org.eclipse.ui.texteditor.AbstractTextEditor.initializeSourceViewer(AbstractTextEditor.java:4030)
at
org.eclipse.ui.texteditor.AbstractTextEditor.createPartControl(AbstractTextEditor.java:3558)
at
org.eclipse.ui.texteditor.StatusTextEditor.createPartControl(StatusTextEditor.java:54)
at
org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.createPartControl(AbstractDecoratedTextEditor.java:440)
at
org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.createPartControl(JavaEditor.java:3098)
at
org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.createPartControl(CompilationUnitEditor.java:1505)
at
org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:670)
at
org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465)
at
org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
at
org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:289)
at
org.eclipse.ui.internal.WorkbenchPage.makeActiveEditor(WorkbenchPage.java:1342)
at
org.eclipse.ui.internal.WorkbenchPage.updateActivePart(WorkbenchPage.java:1300)
at
org.eclipse.ui.internal.WorkbenchPage.partAdded(WorkbenchPage.java:1780)
at
org.eclipse.ui.internal.ViewFactory.createView(ViewFactory.java:173)
at
org.eclipse.ui.internal.Perspective.showView(Perspective.java:2244)
at
org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:1145)
at
org.eclipse.ui.internal.WorkbenchPage$20.run(WorkbenchPage.java:3921)
at
org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at
org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3918)
at
org.eclipse.ui.handlers.ShowViewHandler.openView(ShowViewHandler.java:162)
at
org.eclipse.ui.handlers.ShowViewHandler.execute(ShowViewHandler.java:76)
at
org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:293)
at
org.eclipse.core.commands.Command.executeWithChecks(Command.java:499)
at
org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
at
org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)
at
org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:241)
at
org.eclipse.ui.menus.CommandContributionItem.handleWidgetSelection(CommandContributionItem.java:829)
at
org.eclipse.ui.menus.CommandContributionItem.access$19(CommandContributionItem.java:815)
at
org.eclipse.ui.menus.CommandContributionItem$5.handleEvent(CommandContributionItem.java:805)
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:2701)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665) at
org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499) at
org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679) at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
at
org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)