Hi to all. I am trying format a date with:
<s:convertDateTime type="date" dateStyle="short" pattern="dd/MM/yyyy"/>

but i have the following error:
<s:convertDateTime> Parent not an instance of ValueHolder

and the Stack Trace:
com.sun.facelets.tag.TagException: /PersonaEdit.xhtml @87,81 <s:convertDateTime> Parent not an instance of ValueHolder: org.jboss.seam.ui.component.html.HtmlDecorate@df2a05
        at com.sun.facelets.tag.jsf.ConvertHandler.apply(ConvertHandler.java:93)
        at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
        at com.sun.facelets.tag.ui.DecorateHandler.apply(DecorateHandler.java:122)
        at com.sun.facelets.impl.DefaultFaceletContext$TemplateManager.apply(DefaultFaceletContext.java:337)
        at com.sun.facelets.impl.DefaultFaceletContext.includeDefinition(DefaultFaceletContext.java:307)
        at com.sun.facelets.tag.ui.InsertHandler.apply(InsertHandler.java:68)
        at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
        at com.sun.facelets.tag.ui.CompositionHandler.apply(CompositionHandler.java:119)
        at com.sun.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:49)
        at com.sun.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:25)
        at com.sun.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:248)
        at com.sun.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:294)
        at com.sun.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:273)
        at com.sun.facelets.impl.DefaultFaceletContext.includeFacelet(DefaultFaceletContext.java:140)
        at com.sun.facelets.tag.ui.DecorateHandler.apply(DecorateHandler.java:105)
        at org.jboss.seam.ui.handler.DecorateHandler.applyNextHandler(DecorateHandler.java:32)
        at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169)
        at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
        at com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:314)
        at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169)
        at com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:314)
        at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169)
        at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
        at com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:314)
        at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169)
        at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
        at com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:314)
        at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169)
        at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
        at com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:314)
        at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169)
        at com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:314)
        at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169)
        at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
        at com.sun.facelets.tag.ui.DefineHandler.applyDefinition(DefineHandler.java:64)
        at com.sun.facelets.tag.ui.CompositionHandler.apply(CompositionHandler.java:131)
        at com.sun.facelets.impl.DefaultFaceletContext$TemplateManager.apply(DefaultFaceletContext.java:337)
        at com.sun.facelets.impl.DefaultFaceletContext.includeDefinition(DefaultFaceletContext.java:307)
        at com.sun.facelets.tag.ui.InsertHandler.apply(InsertHandler.java:68)
        at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
        at com.sun.facelets.tag.jsf.core.ViewHandler.apply(ViewHandler.java:109)
        at com.sun.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:49)
        at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
        at com.sun.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:25)
        at com.sun.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:248)
        at com.sun.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:294)
        at com.sun.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:273)
        at com.sun.facelets.impl.DefaultFaceletContext.includeFacelet(DefaultFaceletContext.java:140)
        at com.sun.facelets.tag.ui.CompositionHandler.apply(CompositionHandler.java:113)
        at com.sun.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:49)
        at com.sun.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:25)
        at com.sun.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:95)
        at com.sun.facelets.FaceletViewHandler.buildView(FaceletViewHandler.java:524)
        at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:567)
        at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
        at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:196)
        at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:109)
        at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
        at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
        at org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
        at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
        at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
        at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
        at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:177)
        at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:267)
        at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:380)
        at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:507)
        at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
        at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
        at org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
        at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        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:230)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
        at java.lang.Thread.run(Thread.java:619)

Can anybody help me?

Thanks a lot.