yui manager unable to register

20.04.2011 14:23:19 ERROR [org.apache.wicket.RequestCycle.onExceptionLoop():1395] unexpected exception when handling another exception: Exception in rendering component: [MarkupContainer [Component id = _header_0]]
org.apache.wicket.WicketRuntimeException: Exception in rendering component: [MarkupContainer [Component id = _header_0]]
at org.apache.wicket.Component.renderComponent(Component.java:2729)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1539)
at org.apache.wicket.Component.render(Component.java:2521)
at org.apache.wicket.MarkupContainer.autoAdd(MarkupContainer.java:229)
at org.apache.wicket.markup.resolver.HtmlHeaderResolver.resolve(HtmlHeaderResolver.java:80)
at org.apache.wicket.markup.resolver.ComponentResolvers.resolve(ComponentResolvers.java:81)
at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1445)
at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1555)
at org.apache.wicket.Page.onRender(Page.java:1594)
at org.apache.wicket.Component.render(Component.java:2521)
at org.apache.wicket.Page.renderPage(Page.java:932)
at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.respond(BookmarkablePageRequestTarget.java:261)
at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:105)
at org.apache.wicket.RequestCycle.respond(RequestCycle.java:1267)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1334)
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:486)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:319)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.hippoecm.frontend.ResourceRewriteFilter.doFilter(ResourceRewriteFilter.java:129)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.hippoecm.frontend.plugins.login.ConcurrentLoginFilter.doFilter(ConcurrentLoginFilter.java:54)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:396)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalStateException: Page has no yui manager behavior, unable to register module dependencies.
at org.hippoecm.frontend.plugins.yui.AbstractYuiBehavior.renderHead(AbstractYuiBehavior.java:79)
at org.apache.wicket.Component.renderHead(Component.java:2772)
at org.apache.wicket.markup.html.panel.Panel.renderHead(Panel.java:138)
at org.apache.wicket.markup.html.internal.HtmlHeaderContainer$1.component(HtmlHeaderContainer.java:231)
at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:900)
at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:940)
at org.apache.wicket.markup.html.internal.HtmlHeaderContainer.renderHeaderSections(HtmlHeaderContainer.java:222)
at org.apache.wicket.markup.html.internal.HtmlHeaderContainer.onComponentTagBody(HtmlHeaderContainer.java:137)
at org.apache.wicket.Component.renderComponent(Component.java:2690)
... 38 more