#9 java.lang.NullPointerException

[subesingh]

When try to open the *.rules file it give the following error

java.lang.NullPointerException
at org.dbe.businessModeller.vocabulary.enterprise.grammar.VocabularyParser.vocabulary(VocabularyParser.java:99)
at org.dbe.businessModeller.ruleset.ui.editors.utils.RulesetWordRule.preParsing(RulesetWordRule.java:575)
at org.dbe.businessModeller.ruleset.ui.editors.utils.RulesetWordRule.evaluate(RulesetWordRule.java:299)
at org.eclipse.jface.text.rules.RuleBasedScanner.nextToken(RuleBasedScanner.java:155)
at org.eclipse.jface.text.rules.DefaultDamagerRepairer.createPresentation(DefaultDamagerRepairer.java:168)
at org.eclipse.jface.text.presentation.PresentationReconciler.createPresentation(PresentationReconciler.java:448)
at org.eclipse.jface.text.presentation.PresentationReconciler.processDamage(PresentationReconciler.java:560)
at org.eclipse.jface.text.presentation.PresentationReconciler.access$3(PresentationReconciler.java:558)
at org.eclipse.jface.text.presentation.PresentationReconciler$InternalListener.inputDocumentChanged(PresentationReconciler.java:118)
at org.eclipse.jface.text.TextViewer.fireInputDocumentChanged(TextViewer.java:2458)
at org.eclipse.jface.text.TextViewer.setDocument(TextViewer.java:2507)
at org.eclipse.jface.text.source.SourceViewer.setDocument(SourceViewer.java:521)
at org.eclipse.jface.text.source.projection.ProjectionViewer.setDocument(ProjectionViewer.java:370)
at org.eclipse.jface.text.source.SourceViewer.setDocument(SourceViewer.java:467)
at org.eclipse.ui.texteditor.AbstractTextEditor.initializeSourceViewer(AbstractTextEditor.java:2937)
at org.eclipse.ui.texteditor.AbstractTextEditor.createPartControl(AbstractTextEditor.java:2684)
at org.eclipse.ui.texteditor.StatusTextEditor.createPartControl(StatusTextEditor.java:53)
at org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.createPartControl(AbstractDecoratedTextEditor.java:367)
at org.dbe.businessModeller.ruleset.ui.editors.RulesetEditor.createPartControl(RulesetEditor.java:196)
at org.eclipse.ui.part.MultiPageEditorPart.addPage(MultiPageEditorPart.java:183)
at org.eclipse.ui.part.MultiPageEditorPart.addPage(MultiPageEditorPart.java:153)
at org.dbe.businessModeller.ruleset.ui.editors.RulesetMainEditor.createPage0(RulesetMainEditor.java:171)
at org.dbe.businessModeller.ruleset.ui.editors.RulesetMainEditor.createPages(RulesetMainEditor.java:264)
at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:276)
at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:596)