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java.lang.NullPointerException: 	at org.eclipse.acceleo.query.parser.AstValidator.validate(AstValidator.java:871)	at org.obeonetwork.m2doc.generator.TemplateValidator.caseConditionnal(TemplateValidator.java:159)	at org.obeonetwork.m2doc.generator.TemplateValidator.caseConditionnal(TemplateValidator.java:1)	at org.obeonetwork.m2doc.template.util.TemplateSwitch.doSwitch(TemplateSwitch.java:94)	at org.eclipse.emf.ecore.util.Switch.doSwitch(Switch.java:53)	at org.eclipse.emf.ecore.util.Switch.doSwitch(Switch.java:69)	at org.obeonetwork.m2doc.generator.TemplateValidator.caseRepetition(TemplateValidator.java:289)	at org.obeonetwork.m2doc.generator.TemplateValidator.caseRepetition(TemplateValidator.java:1)	at org.obeonetwork.m2doc.template.util.TemplateSwitch.doSwitch(TemplateSwitch.java:102)	at org.eclipse.emf.ecore.util.Switch.doSwitch(Switch.java:53)	at org.eclipse.emf.ecore.util.Switch.doSwitch(Switch.java:69)	at org.obeonetwork.m2doc.generator.TemplateValidator.caseTemplate(TemplateValidator.java:151)	at org.obeonetwork.m2doc.generator.TemplateValidator.caseTemplate(TemplateValidator.java:1)	at org.obeonetwork.m2doc.template.util.TemplateSwitch.doSwitch(TemplateSwitch.java:149)	at org.eclipse.emf.ecore.util.Switch.doSwitch(Switch.java:53)	at org.eclipse.emf.ecore.util.Switch.doSwitch(Switch.java:69)	at org.obeonetwork.m2doc.generator.TemplateValidator.caseDocumentTemplate(TemplateValidator.java:139)	at org.obeonetwork.m2doc.generator.TemplateValidator.caseDocumentTemplate(TemplateValidator.java:1)	at org.obeonetwork.m2doc.template.util.TemplateSwitch.doSwitch(TemplateSwitch.java:192)	at org.eclipse.emf.ecore.util.Switch.doSwitch(Switch.java:53)	at org.eclipse.emf.ecore.util.Switch.doSwitch(Switch.java:69)	at org.obeonetwork.m2doc.generator.TemplateValidator.validate(TemplateValidator.java:130)	at org.obeonetwork.m2doc.generator.TemplateValidator.validate(TemplateValidator.java:108)	at org.obeonetwork.m2doc.generator.TemplateValidator.validate(TemplateValidator.java:92)	at org.obeonetwork.m2doc.api.GenconfToDocumentGenerator.validate(GenconfToDocumentGenerator.java:262)	at org.obeonetwork.m2doc.api.GenconfToDocumentGenerator.generate(GenconfToDocumentGenerator.java:127)	at org.obeonetwork.m2doc.api.GenconfToDocumentGenerator.generate(GenconfToDocumentGenerator.java:93)	at org.obeonetwork.m2doc.ui.command.GenerateHandler.execute(GenerateHandler.java:66)	at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:295)	at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:90)	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.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)	at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:282)	at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:264)	at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)	at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:152)	at org.eclipse.core.commands.Command.executeWithChecks(Command.java:494)	at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:488)	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:210)	at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.executeItem(HandledContributionItem.java:433)	at org.eclipse.e4.ui.workbench.renderers.swt.AbstractContributionItem.handleWidgetSelection(AbstractContributionItem.java:454)	at org.eclipse.e4.ui.workbench.renderers.swt.AbstractContributionItem$3.handleEvent(AbstractContributionItem.java:482)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4410)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4228)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3816)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1121)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022)	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:150)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:687)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:604)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)	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:673)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610)	at org.eclipse.equinox.launcher.Main.run(Main.java:1519)	at org.eclipse.equinox.launcher.Main.main(Main.java:1492)