Sp2 Corpv2 blog: error in validating blog entries

On my online test demo (in two lang), I know have some problems validating a blog entry:

2007-06-13 15:19:18,609: ERROR [org.jahia.engines.addcontainer.AddContainer_Engine] - Error in validating :
java.lang.ClassNotFoundException: jahiatemplates.org.jahia.corporateportal.validation.beans.BlogValidationBean
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1352)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1198)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.jahia.engines.addcontainer.AddContainer_Engine.validate(AddContainer_Engine.java:1224)
at org.jahia.engines.addcontainer.AddContainer_Engine.processCurrentScreen(AddContainer_Engine.java:639)
at org.jahia.engines.addcontainer.AddContainer_Engine.handleActions(AddContainer_Engine.java:279)
at org.jahia.operations.valves.EngineValve.invoke(EngineValve.java:136)
at org.jahia.pipelines.impl.GenericPipeline.invokeNext(GenericPipeline.java:208)
at org.jahia.operations.valves.J2ProcessActionValve.invoke(J2ProcessActionValve.java:144)
at org.jahia.pipelines.impl.GenericPipeline.invokeNext(GenericPipeline.java:208)
at org.jahia.operations.valves.CacheReadValve.invoke(CacheReadValve.java:65)
at org.jahia.pipelines.impl.GenericPipeline.invokeNext(GenericPipeline.java:208)
at org.jahia.operations.valves.PageAccessCheckValve.invoke(PageAccessCheckValve.java:64)
at org.jahia.pipelines.impl.GenericPipeline.invokeNext(GenericPipeline.java:208)
at org.jahia.operations.valves.OperationModeCheckValve.invoke(OperationModeCheckValve.java:83)
at org.jahia.pipelines.impl.GenericPipeline.invokeNext(GenericPipeline.java:208)
at org.jahia.operations.valves.SiteCheckValve.invoke(SiteCheckValve.java:78)
at org.jahia.pipelines.impl.GenericPipeline.invokeNext(GenericPipeline.java:208)
at org.jahia.operations.valves.EsiFragmentCacheReadValve.invoke(EsiFragmentCacheReadValve.java:326)
at org.jahia.pipelines.impl.GenericPipeline.invokeNext(GenericPipeline.java:208)
at org.jahia.operations.valves.EsiUrlCookieCheckValve.invoke(EsiUrlCookieCheckValve.java:313)
at org.jahia.pipelines.impl.GenericPipeline.invokeNext(GenericPipeline.java:208)
at org.jahia.pipelines.impl.GenericPipeline.invoke(GenericPipeline.java:195)
at org.jahia.operations.OperationManager.handleOperations(OperationManager.java:100)
at org.jahia.bin.JahiaAction.execute(JahiaAction.java:72)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
at org.jahia.bin.JahiaRequestProcessor.process(JahiaRequestProcessor.java:82)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
at org.jahia.bin.Jahia.process(Jahia.java:1612)
at org.jahia.bin.Jahia.service(Jahia.java:841)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.jahia.bin.filters.esi.ESIFilter.doFilter(ESIFilter.java:110)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:619)
2007-06-13 15:19:21,796: DEBUG [jsp.jahia.engines.engine] - LastScreen: save, JspSource: close, EngineName: addcontainer
2007-06-13 15:19:21,796: DEBUG [jsp.jahia.engines.engine] - JSP: /jsp/jahia/engines/shared/close.jsp
2007-06-13 15:19:22,328: INFO [org.jahia.bin.Jahia] - Processed [/jahia/Jahia/engineName/addcontainer/op/edit/home/blogs/John] user=[root] ip=[127.0.0.1] in [3735ms]