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java.lang.IllegalArgumentException: model object cannot be null	at org.obiba.wicket.markup.html.table.DetachableEntityModel.(DetachableEntityModel.java:28)	at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel$EditParticipantPanelAttributeGroupFragment.addParticipantAttribute(EditParticipantPanel.java:498)	at org.obiba.onyx.webapp.participant.panel.ParticipantAttributeGroupFragment.(ParticipantAttributeGroupFragment.java:28)	at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel$EditParticipantPanelAttributeGroupFragment.(EditParticipantPanel.java:469)	at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel$EditParticipantPanelAttributeGroupsFragment.addAttributeGroupFragment(EditParticipantPanel.java:459)	at org.obiba.onyx.webapp.participant.panel.ParticipantAttributeGroupsFragment.(ParticipantAttributeGroupsFragment.java:48)	at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel$EditParticipantPanelAttributeGroupsFragment.(EditParticipantPanel.java:454)	at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel.createEditParticipantPanel(EditParticipantPanel.java:286)	at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel.(EditParticipantPanel.java:128)	at org.obiba.onyx.webapp.participant.panel.EditParticipantPanel.(EditParticipantPanel.java:144)	at org.obiba.onyx.webapp.participant.panel.EditParticipantFormPanel.(EditParticipantFormPanel.java:28)	at org.obiba.onyx.webapp.participant.page.ParticipantReceptionPage.(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)