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java.lang.IllegalArgumentException: model object cannot be null at org.obiba.wicket.markup.html.table.DetachableEntityModel.<init>(DetachableEntityModel.java:28) at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel$EditParticipantPanelAttributeGroupFragment.addParticipantAttribute(EditParticipantPanel.java:498) at org.obiba.onyx.webapp.participant.panel.ParticipantAttributeGroupFragment.<init>(ParticipantAttributeGroupFragment.java:28) at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel$EditParticipantPanelAttributeGroupFragment.<init>(EditParticipantPanel.java:469) at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel$EditParticipantPanelAttributeGroupsFragment.addAttributeGroupFragment(EditParticipantPanel.java:459) at org.obiba.onyx.webapp.participant.panel.ParticipantAttributeGroupsFragment.<init>(ParticipantAttributeGroupsFragment.java:48) at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel$EditParticipantPanelAttributeGroupsFragment.<init>(EditParticipantPanel.java:454) at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel.createEditParticipantPanel(EditParticipantPanel.java:286) at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel.<init>(EditParticipantPanel.java:128) at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel.<init>(EditParticipantPanel.java:144) at org.obiba.onyx.webapp.participant.panel.EditParticipantFormPanel.<init>(EditParticipantFormPanel.java:28) at org.obiba.onyx.webapp.participant.page.ParticipantReceptionPage.<init>(ParticipantReceptionPage.java:40) at org.obiba.onyx.webapp.participant.page.ParticipantSearchPage$ActionListFragment$3.onClick(ParticipantSearchPage.java:844) at org.apache.wicket.ajax.markup.html.AjaxLink$1.onEvent(AjaxLink.java:68) at org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:177) at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:299) at org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:119) at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250) at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428) at org.apache.wicket.RequestCycle.request(RequestCycle.java:545) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:479) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:312) at org.mortbay.jetty.servlet.ServletHandler$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$CachedChain.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230) at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)