Clustering not enable, trying to enable but its shows errors;

Hi, When ever I try to enable clustering, I get:

Failed to start or join an existing cluster. Check the error log for more information.

Server is running Openfire version 3.7.0,

Server-to-Server is enabled, close idle after 10mins, “Anyone” accessible.

DB-backend is MySQL.

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From the log:

2010.09.15 14:44:09 Unable to start clustering - continuing in local mode
(Wrapped: Failed to load the factory) java.lang.ClassNotFoundException: com.jivesoftware.util.cache.JiveConfigurableCacheFactory
at com.tangosol.util.Base.ensureRuntimeException(Base.java:293)
at com.tangosol.net.DefaultCacheFactoryBuilder.getDefaultFactory(DefaultCacheFacto ryBuilder.java:419)
at com.tangosol.net.DefaultCacheFactoryBuilder.getSingletonFactory(DefaultCacheFac toryBuilder.java:113)
at com.tangosol.net.DefaultCacheFactoryBuilder.getFactory(DefaultCacheFactoryBuild er.java:173)
at com.tangosol.net.DefaultCacheFactoryBuilder.getConfigurableCacheFactory(Default CacheFactoryBuilder.java:149)
at com.tangosol.net.CacheFactory.getConfigurableCacheFactory(CacheFactory.java:657 )
at com.tangosol.net.CacheFactory.getCache(CacheFactory.java:735)
at com.tangosol.net.CacheFactory.getCache(CacheFactory.java:712)
at com.jivesoftware.util.cache.CoherenceClusteredCacheFactory.startCluster(Coheren ceClusteredCacheFactory.java:95)
at org.jivesoftware.util.cache.CacheFactory.startClustering(CacheFactory.java:580)
at org.jivesoftware.openfire.cluster.ClusterManager.startup(ClusterManager.java:27 0)
at org.jivesoftware.openfire.cluster.ClusterManager.setClusteringEnabled(ClusterMa nager.java:320)
at org.jivesoftware.openfire.admin.system_002dclustering_jsp._jspService(system_00 2dclustering_jsp.java:103)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:530)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1216)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:11 8)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1187)
at org.jivesoftware.util.LocaleFilter.doFilter(LocaleFilter.java:74)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1187)
at org.jivesoftware.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingF ilter.java:50)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1187)
at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:78)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1187)
at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:164)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1187)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:425)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:494)
at org.eclipse.jetty.server.session.SessionHandler.handle(SessionHandler.java:182)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:93 3)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:362)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:867 )
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandler Collection.java:245)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.jav a:126)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113)
at org.eclipse.jetty.server.Server.handle(Server.java:334)
at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:559)
at org.eclipse.jetty.server.HttpConnection$RequestHandler.content(HttpConnection.j ava:1007)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:747)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:209)
at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:406)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:4 62)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.jivesoftware.util.cache.JiveConfigurableCacheFactory
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 java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.tangosol.net.DefaultCacheFactoryBuilder.getDefaultFactory(DefaultCacheFacto ryBuilder.java:377)
… 46 more

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I don’t know wharts logs saying and how we fix this issue.

Please help me to fix this issue?

Thanks,

Adeel Akbar