[xwiki-devs] problem installing xwiki

Hi i'm trying to install xwiki on ubuntu 8.10 with Tomcat5.5, JVM 1.6 and mysql 5.0 I have followed instructions of http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Installation I ve tried to google this error but i didn't find a solution. When trying to access my xwiki app, i have the following message : javax.servlet.ServletException: L'exécution de la servlet a lancé une exception com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:94) com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:287) com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112) *cause mère* java.lang.NoClassDefFoundError: org/jgroups/blocks/RpcDispatcher$Marshaller java.lang.ClassLoader.defineClass1(Native Method) java.lang.ClassLoader.defineClass(ClassLoader.java:621) java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1853) org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:875) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1330) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1209) java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) java.lang.Class.getDeclaredMethods0(Native Method) java.lang.Class.privateGetDeclaredMethods(Class.java:2427) java.lang.Class.getDeclaredMethods(Class.java:1791) org.jboss.cache.util.reflect.ReflectionUtil.inspectRecursively(ReflectionUtil.java:53) org.jboss.cache.util.reflect.ReflectionUtil.getAllMethods(ReflectionUtil.java:36) org.jboss.cache.factories.ComponentRegistry.addComponentDependencies(ComponentRegistry.java:232) org.jboss.cache.factories.ComponentRegistry.registerComponent(ComponentRegistry.java:219) org.jboss.cache.factories.ComponentRegistry.<init>(ComponentRegistry.java:98) org.jboss.cache.DefaultCacheFactory.bootstrap(DefaultCacheFactory.java:125) org.jboss.cache.DefaultCacheFactory.createAndWire(DefaultCacheFactory.java:115) org.jboss.cache.DefaultCacheFactory.createCache(DefaultCacheFactory.java:94) org.jboss.cache.DefaultCacheFactory.createCache(DefaultCacheFactory.java:79) org.xwiki.cache.jbosscache.internal.JBossCacheCache.initialize(JBossCacheCache.java:101) org.xwiki.cache.jbosscache.internal.JBossCacheCacheFactory.newCache(JBossCacheCacheFactory.java:78) com.xpn.xwiki.store.XWikiCacheStore.initCache(XWikiCacheStore.java:99) com.xpn.xwiki.store.XWikiCacheStore.initCache(XWikiCacheStore.java:84) com.xpn.xwiki.store.XWikiCacheStore.<init>(XWikiCacheStore.java:64) com.xpn.xwiki.XWiki.initXWiki(XWiki.java:679) com.xpn.xwiki.XWiki.<init>(XWiki.java:655) com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:315) com.xpn.xwiki.XWiki.getXWiki(XWiki.java:386) com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:135) com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115) org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431) org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) javax.servlet.http.HttpServlet.service(HttpServlet.java:689) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:94) com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:287) com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112) *cause mère* java.lang.ClassNotFoundException: org.jgroups.blocks.RpcDispatcher$Marshaller org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1363) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1209) java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) java.lang.ClassLoader.defineClass1(Native Method) java.lang.ClassLoader.defineClass(ClassLoader.java:621) java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1853) org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:875) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1330) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1209) java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) java.lang.Class.getDeclaredMethods0(Native Method) java.lang.Class.privateGetDeclaredMethods(Class.java:2427) java.lang.Class.getDeclaredMethods(Class.java:1791) org.jboss.cache.util.reflect.ReflectionUtil.inspectRecursively(ReflectionUtil.java:53) org.jboss.cache.util.reflect.ReflectionUtil.getAllMethods(ReflectionUtil.java:36) org.jboss.cache.factories.ComponentRegistry.addComponentDependencies(ComponentRegistry.java:232) org.jboss.cache.factories.ComponentRegistry.registerComponent(ComponentRegistry.java:219) org.jboss.cache.factories.ComponentRegistry.<init>(ComponentRegistry.java:98) org.jboss.cache.DefaultCacheFactory.bootstrap(DefaultCacheFactory.java:125) org.jboss.cache.DefaultCacheFactory.createAndWire(DefaultCacheFactory.java:115) org.jboss.cache.DefaultCacheFactory.createCache(DefaultCacheFactory.java:94) org.jboss.cache.DefaultCacheFactory.createCache(DefaultCacheFactory.java:79) org.xwiki.cache.jbosscache.internal.JBossCacheCache.initialize(JBossCacheCache.java:101) org.xwiki.cache.jbosscache.internal.JBossCacheCacheFactory.newCache(JBossCacheCacheFactory.java:78) com.xpn.xwiki.store.XWikiCacheStore.initCache(XWikiCacheStore.java:99) com.xpn.xwiki.store.XWikiCacheStore.initCache(XWikiCacheStore.java:84) com.xpn.xwiki.store.XWikiCacheStore.<init>(XWikiCacheStore.java:64) com.xpn.xwiki.XWiki.initXWiki(XWiki.java:679) com.xpn.xwiki.XWiki.<init>(XWiki.java:655) com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:315) com.xpn.xwiki.XWiki.getXWiki(XWiki.java:386) com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:135) com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115) org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431) org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) javax.servlet.http.HttpServlet.service(HttpServlet.java:689) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:94) com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:287) com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112) Thanks for your time.