Hi, can somebody please help me with zimlet isntallation under Windows XP. What am I doing wrong?

C:\Program Files\Zimbra\Zimbra Desktop>java -cp jetty\lib\log4j-1.2.8.jar;jetty\
common\lib\commons-httpclient-3.0.jar;jetty\common\lib\mail.jar;jetty\common\lib
\commons-logging.jar;jetty\common\lib\commons-codec-1.3.jar;jetty\common\lib\jso
n.jar;jetty\common\lib\dom4j-1.5.jar;jetty\common\lib\zimbracommon.jar;jetty\we b
apps\service\WEB-INF\lib\zimbrastore.jar -Dzimbra.config=conf\localconfig.xml co
m.zimbra.cs.zimlet.ZimletUtil deploy zimlets/com_zimbra_emaildownloader.zip
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Logg
er
at com.zimbra.common.util.LogFactory.getLog(LogFactor y.java:49)
at com.zimbra.common.util.ZimbraLog.<clinit>(ZimbraLo g.java:109)
at com.zimbra.common.util.CliUtil.toolSetup(CliUtil.j ava:33)
at com.zimbra.common.util.CliUtil.toolSetup(CliUtil.j ava:29)
at com.zimbra.common.util.CliUtil.toolSetup(CliUtil.j ava:25)
at com.zimbra.cs.zimlet.ZimletUtil.main(ZimletUtil.ja va:1890)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger
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)
... 6 more

C:\Program Files\Zimbra\Zimbra Desktop>

Please, thanks in advance.