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java.lang.NullPointerException: 	at org.obiba.onyx.quartz.editor.questionnaire.QuestionnairePanel$5.getResourceStream(QuestionnairePanel.java:217)	at org.obiba.onyx.quartz.editor.utils.AJAXDownload.onRequest(AJAXDownload.java:33)	at org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:119)	at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)	at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)	at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)	at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1436)	at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)	at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:484)	at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:317)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Unknown Source)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(Unknown Source)	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Unknown Source)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(Unknown Source)	at org.apache.catalina.core.StandardWrapperValve.invoke(Unknown Source)	at org.apache.catalina.core.StandardContextValve.invoke(Unknown Source)	at org.apache.catalina.core.StandardHostValve.invoke(Unknown Source)	at org.apache.catalina.valves.ErrorReportValve.invoke(Unknown Source)	at org.apache.catalina.core.StandardEngineValve.invoke(Unknown Source)	at org.apache.catalina.connector.CoyoteAdapter.service(Unknown Source)	at org.apache.coyote.http11.Http11Processor.process(Unknown Source)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Unknown Source)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(Unknown Source)	at java.lang.Thread.run(Thread.java:619)