Error when starting server with ZK pluggin

06-sep-2012 11:54:09 org.apache.catalina.core.AprLifecycleListener init
INFO: La biblioteca nativa de Apache Tomcat basada en ARP que permite un rendimiento óptimo en entornos de desarrollo no ha sido hallada en java.library.path: C:\Program Files (x86)\Java\jre6\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files (x86)\Business Objects\Common\3.5\bin\NOTES\;C:\Program Files (x86)\Business Objects\Common\3.5\bin\NOTES\DATA\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Users\sgb\Downloads\axis2-1.6.1-bin\axis2-1.6.1\bin;C:\Program Files\TortoiseSVN\bin;C:\Program Files\Windows Imaging\;c:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;c:\Program Files\Microsoft SQL Server\100\Tools\Binn\;c:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\Program Files (x86)\QuickTime\QTSystem\;.
06-sep-2012 11:54:09 org.apache.tomcat.util.digester.SetPropertiesRule begin
ADVERTENCIA: {Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:StsWeb' did not find a matching property.
06-sep-2012 11:54:09 org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
06-sep-2012 11:54:09 org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
06-sep-2012 11:54:09 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 830 ms
06-sep-2012 11:54:09 org.apache.catalina.core.StandardService startInternal
INFO: Arrancando servicio Catalina
06-sep-2012 11:54:09 org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.23
06-sep-2012 11:54:10 org.apache.catalina.core.StandardContext listenerStart
GRAVE: Error configurando escuchador de aplicación de clase org.sts.generales.EventosAplicacion.ControladorSesiones
java.lang.NoClassDefFoundError: org/zkoss/zk/ui/http/HttpSessionListener
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClassCond(Unknown Source)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.access$000(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1603)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1533)
	at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:525)
	at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:507)
	at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:124)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4701)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5260)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1525)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1515)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.zkoss.zk.ui.http.HttpSessionListener
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 27 more
06-sep-2012 11:54:10 org.apache.catalina.core.StandardContext listenerStart
GRAVE: Se ha saltado la instalación de escuchadores de aplicación debido a error(es) previo(s)
06-sep-2012 11:54:10 org.apache.catalina.core.StandardContext startInternal
GRAVE: Error listenerStart
06-sep-2012 11:54:10 org.apache.catalina.core.StandardContext startInternal
GRAVE: Falló en arranque del Contexto  debido a errores previos
06-sep-2012 11:54:11 org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
06-sep-2012 11:54:11 org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
06-sep-2012 11:54:11 org.apache.catalina.startup.Catalina start
INFO: Server startup in 1084 ms

06-sep-2012 11:52:43 org.apache.catalina.core.AprLifecycleListener init
INFO: La biblioteca nativa de Apache Tomcat basada en ARP que permite un rendimiento óptimo en entornos de desarrollo no ha sido hallada en java.library.path: C:\Archivos de programa\Java\jre6\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Archivos de programa/Java/jre6/bin/client;C:/Archivos de programa/Java/jre6/bin;C:/Archivos de programa/Java/jre6/lib/i386;C:\Archivos de programa\Business Objects\Common\3.5\bin\NOTES\;C:\Archivos de programa\Business Objects\Common\3.5\bin\NOTES\DATA\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\java\jdk\bin;C:\Archivos de programa\TortoiseSVN\bin;C:\Archivos de programa\QuickTime\QTSystem\;C:\eclipse helios;;.
06-sep-2012 11:52:43 org.apache.tomcat.util.digester.SetPropertiesRule begin
ADVERTENCIA: {Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:StsWeb' did not find a matching property.
06-sep-2012 11:52:44 org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
06-sep-2012 11:52:44 org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
06-sep-2012 11:52:44 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 482 ms
06-sep-2012 11:52:44 org.apache.catalina.core.StandardService startInternal
INFO: Arrancando servicio Catalina
06-sep-2012 11:52:44 org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.23
06-sep-2012 11:52:44 org.zkoss.zk.ui.http.WebManager <init>:115
INFO: Starting ZK 6.1.0-FL EE (build: 2012061118)
06-sep-2012 11:52:44 org.zkoss.zk.ui.sys.ConfigParser parseConfigXml:160
INFO: Loading system default
06-sep-2012 11:52:44 org.zkoss.zk.ui.sys.ConfigParser parse:267
INFO: Parsing jndi:/localhost/StsWeb/WEB-INF/zk.xml