ClassNotFoundException: org.alfresco.web.app.servlet.Kerbero

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Trying to configure AD authentication in Alfresco 2.1 GA

Followed step-by-step instructions from http://wiki.alfresco.com/wiki/Configuring_the_CIFS_and_web_servers_for_Kerberos/AD_integration
(Very good instructions indeed).

So far, so good.
But, Unfortunately got error when starting the server (using tomcat 5.5.25)

ERROR [org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/alfresco]] Exception starting filter Authentication Filter
java.lang.ClassNotFoundException: org.alfresco.web.app.servlet.KerberosAuthenticationFilter
   at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1362)
   at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1208)
   at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:207)
   at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302)
   at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78)
   at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3635)
   at org.apache.catalina.core.StandardContext.start(StandardContext.java:4222)
   at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
   at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
   at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
   at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:825)
   at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:714)
   at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:490)
   at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
   at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
   at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
   at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
   at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
   at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
   at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
   at org.apache.catalina.core.StandardService.start(StandardService.java:448)
   at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
   at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:585)
   at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
   at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
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No information/help found in Google!!!!

Please HELP…

Thanks very much in advance.

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I have searched for this class file in the JAR file also.

As per http://dev.alfresco.com/resource/docs/java/web-client/org/alfresco/web/app/servlet/KerberosAuthenticationFilter.html page this class should be in

org.alfresco.web.app.servlet.KerberosAuthenticationFilter‍

I opened JAR file

webapps\alfresco\WEB-INF\lib\alfresco-web-client.jar‍

There AbstractAuthenticationFilter class is there, but not the KerberosAuthenticationFilter class.

Am I missing something?
Where from can I get this class?

Please HELP.

Thanks.