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Argument cannot be null
java.lang.IllegalArgumentException: Argument not valid	at org.eclipse.swt.SWT.error(SWT.java:3865)	at org.eclipse.swt.SWT.error(SWT.java:3799)	at org.eclipse.swt.SWT.error(SWT.java:3770)	at org.eclipse.swt.custom.StyledText.setCaretOffset(StyledText.java:7882)	at org.apache.uima.caseditor.editor.AnnotationEditor.selectionChanged(AnnotationEditor.java:950)	at org.apache.uima.caseditor.editor.AnnotationEditor$DocumentListener.updatedAnnotation(AnnotationEditor.java:300)	at org.apache.uima.caseditor.editor.AbstractAnnotationDocumentListener.updated(AbstractAnnotationDocumentListener.java:75)	at org.apache.uima.caseditor.editor.AbstractDocumentListener.updated(AbstractDocumentListener.java:62)	at org.apache.uima.caseditor.editor.AbstractDocument.fireUpdatedFeatureStructure(AbstractDocument.java:114)	at org.apache.uima.caseditor.editor.DocumentUimaImpl.update(DocumentUimaImpl.java:145)	at org.apache.uima.caseditor.editor.AnnotationDocument.update(AnnotationDocument.java:132)	at org.apache.uima.caseditor.editor.action.WideRightAnnotationSideAction.wideRightAnnotationSide(WideRightAnnotationSideAction.java:65)	at org.apache.uima.caseditor.editor.action.WideRightAnnotationSideAction.run(WideRightAnnotationSideAction.java:77)	at org.eclipse.ui.actions.BaseSelectionListenerAction.runWithEvent(BaseSelectionListenerAction.java:168)	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)	at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)	at org.eclipse.jface.action.ActionContributionItem$6.handleEvent(ActionContributionItem.java:452)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1176)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3493)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3112)	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)	at org.eclipse.equinox.launcher.Main.main(Main.java:1287)