java.lang.NullPointerException

java.lang.NullPointerException
	at org.eclipse.jface.text.rules.FastPartitioner.getPositions(FastPartitioner.java:797)
	at org.eclipse.jface.text.rules.FastPartitioner.getPartition(FastPartitioner.java:479)
	at org.eclipse.jface.text.rules.FastPartitioner.getPartition(FastPartitioner.java:592)
	at org.eclipse.jface.text.rules.FastPartitioner.getContentType(FastPartitioner.java:582)
	at org.eclipse.jface.text.AbstractDocument.getContentType(AbstractDocument.java:1324)
	at org.eclipse.jface.text.TextUtilities.getContentType(TextUtilities.java:373)
	at org.eclipse.jface.text.TextViewer.selectContentTypePlugin(TextViewer.java:3492)
	at org.eclipse.jface.text.TextViewer.customizeDocumentCommand(TextViewer.java:3533)
	at org.eclipse.jface.text.TextViewer.handleVerifyEvent(TextViewer.java:3572)
	at org.eclipse.jface.text.TextViewer$TextVerifyListener.verifyText(TextViewer.java:404)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
	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.Widget.sendEvent(Widget.java:962)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:947)
	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:706)
	at org.eclipse.swt.custom.StyledText.modifyContent(StyledText.java:5725)
	at org.eclipse.swt.custom.StyledText.sendKeyEvent(StyledText.java:6500)
	at org.eclipse.swt.custom.StyledText.doDelete(StyledText.java:2224)
	at org.eclipse.swt.custom.StyledText.invokeAction(StyledText.java:5648)
	at org.eclipse.jface.text.TextViewer.doOperation(TextViewer.java:3728)
	at org.eclipse.jface.text.source.SourceViewer.doOperation(SourceViewer.java:857)
	at org.eclipse.ui.texteditor.TextOperationAction$1.run(TextOperationAction.java:131)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
	at org.eclipse.ui.texteditor.TextOperationAction.run(TextOperationAction.java:129)
	at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
	at org.eclipse.ui.commands.ActionHandler.execute(ActionHandler.java:185)
	at org.eclipse.ui.internal.handlers.LegacyHandlerWrapper.execute(LegacyHandlerWrapper.java:109)
	at org.eclipse.core.commands.Command.executeWithChecks(Command.java:475)
	at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:429)
	at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:165)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:470)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:821)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:879)
	at org.eclipse.ui.internal.keys.OutOfOrderListener.handleEvent(OutOfOrderListener.java:76)
	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.Widget.sendEvent(Widget.java:962)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:947)
	at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:975)
	at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:971)
	at org.eclipse.swt.widgets.Widget.wmKeyDown(Widget.java:1570)
	at org.eclipse.swt.widgets.Control.WM_KEYDOWN(Control.java:3992)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:3701)
	at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:291)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4351)
	at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
	at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2265)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3291)
	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(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	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)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1148)