org.apache.wicket.WicketRuntimeException: Error attaching this container for rendering: [TaxonomyPickerPlugin [Component id = item]]

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org.apache.wicket.WicketRuntimeException: Error attaching this container for rendering: [TaxonomyPickerPlugin [Component id = item]]
at org.onehippo.taxonomy.plugin.MixinClassificationDaoPlugin.getClassification(MixinClassificationDaoPlugin.java:78)
at org.onehippo.taxonomy.plugin.TaxonomyPickerPlugin$2.load(TaxonomyPickerPlugin.java:224)
at org.onehippo.taxonomy.plugin.TaxonomyPickerPlugin$2.load(TaxonomyPickerPlugin.java:213)
at org.apache.wicket.model.LoadableDetachableModel.getObject(LoadableDetachableModel.java:124)
at org.apache.wicket.Component.getDefaultModelObject(Component.java:1612)
at org.apache.wicket.markup.html.list.ListView.getViewSize(ListView.java:218)
at org.apache.wicket.markup.html.list.ListView.onPopulate(ListView.java:472)
at org.apache.wicket.markup.repeater.AbstractRepeater.onBeforeRender(AbstractRepeater.java:123)
at org.apache.wicket.Component.internalBeforeRender(Component.java:949)
at org.apache.wicket.Component.beforeRender(Component.java:1017)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1684)
at org.hippoecm.frontend.service.render.AbstractRenderService.onBeforeRender(AbstractRenderService.java:522)
at org.apache.wicket.Component.internalBeforeRender(Component.java:949)
at org.apache.wicket.Component.beforeRender(Component.java:1017)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1684)
at org.apache.wicket.Component.onBeforeRender(Component.java:3833)
at org.apache.wicket.Component.internalBeforeRender(Component.java:949)
at org.apache.wicket.Component.beforeRender(Component.java:1017)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1684)
at org.apache.wicket.Component.onBeforeRender(Component.java:3833)
at org.apache.wicket.markup.repeater.AbstractRepeater.onBeforeRender(AbstractRepeater.java:143)
at org.apache.wicket.markup.repeater.AbstractPageableView.onBeforeRender(AbstractPageableView.java:115)
at org.apache.wicket.Component.internalBeforeRender(Component.java:949)
at org.apache.wicket.Component.beforeRender(Component.java:1017)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1684)
at org.hippoecm.frontend.service.render.AbstractRenderService.onBeforeRender(AbstractRenderService.java:522)
at org.apache.wicket.Component.internalBeforeRender(Component.java:949)
at org.apache.wicket.Component.beforeRender(Component.java:1017)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1684)
at org.hippoecm.frontend.service.render.AbstractRenderService.onBeforeRender(AbstractRenderService.java:522)
at org.apache.wicket.Component.internalBeforeRender(Component.java:949)
at org.apache.wicket.Component.beforeRender(Component.java:1017)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1684)
at org.hippoecm.frontend.service.render.AbstractRenderService.onBeforeRender(AbstractRenderService.java:522)
at org.apache.wicket.Component.internalBeforeRender(Component.java:949)
at org.apache.wicket.Component.beforeRender(Component.java:1017)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1684)
at org.hippoecm.frontend.service.render.AbstractRenderService.onBeforeRender(AbstractRenderService.java:522)
at org.apache.wicket.Component.internalBeforeRender(Component.java:949)
at org.apache.wicket.Component.beforeRender(Component.java:1017)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1684)
at org.hippoecm.frontend.service.render.AbstractRenderService.onBeforeRender(AbstractRenderService.java:522)
at org.apache.wicket.Component.internalBeforeRender(Component.java:949)
at org.apache.wicket.Component.beforeRender(Component.java:1017)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1684)
at org.apache.wicket.Component.onBeforeRender(Component.java:3833)
at org.apache.wicket.Component.internalBeforeRender(Component.java:949)
at org.apache.wicket.Component.beforeRender(Component.java:1017)
at org.apache.wicket.Component.internalPrepareForRender(Component.java:2201)
at org.apache.wicket.Component.prepareForRender(Component.java:2240)
at org.apache.wicket.ajax.XmlAjaxResponse.writeComponent(XmlAjaxResponse.java:107)
at org.apache.wicket.ajax.AbstractAjaxResponse.writeComponents(AbstractAjaxResponse.java:218)
at org.apache.wicket.ajax.AbstractAjaxResponse.writeTo(AbstractAjaxResponse.java:150)
at org.apache.wicket.ajax.AjaxRequestHandler.respond(AjaxRequestHandler.java:359)
at org.hippoecm.frontend.PluginRequestTarget.respond(PluginRequestTarget.java:150)
at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:261)
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:218)
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:289)
at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:259)
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:201)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.hippoecm.frontend.plugins.login.ConcurrentLoginFilter.doFilter(ConcurrentLoginFilter.java:54)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1517)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.lang.Thread.run(Thread.java:745)

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