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java.lang.NullPointerException at org.obiba.onyx.quartz.core.domain.answer.QuestionAnswer.isActive(QuestionAnswer.java:72) at org.obiba.onyx.quartz.engine.variable.impl.DefaultQuestionToVariableMappingStrategy.getQuestionCount(DefaultQuestionToVariableMappingStrategy.java:556) at org.obiba.onyx.quartz.engine.variable.impl.DefaultQuestionToVariableMappingStrategy.getVariableData(DefaultQuestionToVariableMappingStrategy.java:459) at org.obiba.onyx.quartz.engine.QuartzModule.getVariableData(QuartzModule.java:201) at org.obiba.onyx.engine.variable.VariableDirectory.getVariableData(VariableDirectory.java:189) at org.obiba.onyx.engine.variable.VariableDirectory.getParticipantData(VariableDirectory.java:148) at org.obiba.onyx.engine.variable.export.OnyxDataExport.exportDestination(OnyxDataExport.java:236) at org.obiba.onyx.engine.variable.export.OnyxDataExport.exportInterviews(OnyxDataExport.java:135) at org.obiba.onyx.engine.variable.export.OnyxDataExport$$FastClassByCGLIB$$c7571da3.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149) at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:700) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:635) at org.obiba.onyx.engine.variable.export.OnyxDataExport$$EnhancerByCGLIB$$ca1d605d.exportInterviews(<generated>) at org.obiba.onyx.engine.variable.export.OnyxDataExport$$FastClassByCGLIB$$c7571da3.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149) at org.apache.wicket.proxy.LazyInitProxyFactory$CGLibInterceptor.intercept(LazyInitProxyFactory.java:319) at WICKET_org.obiba.onyx.engine.variable.export.OnyxDataExport$$EnhancerByCGLIB$$417e862f.exportInterviews(<generated>) at org.obiba.onyx.webapp.administration.panel.DataManagementPanel$1$1.onYesButtonClicked(DataManagementPanel.java:61) at org.obiba.onyx.wicket.reusable.ConfirmationDialog$1.onClose(ConfirmationDialog.java:43) at org.obiba.onyx.wicket.reusable.Dialog$7.onClose(Dialog.java:364) at org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow$WindowClosedBehavior.respond(ModalWindow.java:920) at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:299) at org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:113) at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250) at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428) at org.apache.wicket.RequestCycle.request(RequestCycle.java:545) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:456) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:289) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230) at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:536) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:915) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:405) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)