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Clustoring Plugin giving error

When i click on Server > Clustoring link in openfire admin console i got this stack. Why i am get this and what is solution for it?

java.lang.NoClassDefFoundError: com/tangosol/net/Invocable

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:270)

at org.jivesoftware.util.cache.CacheFactory.isClusteringAvailable(CacheFactory.jav a:440)

at org.jivesoftware.openfire.cluster.ClusterManager.isClusteringAvailable(ClusterM anager.java:347)

at org.jivesoftware.openfire.admin.system_002dclustering_jsp._jspService(system_00 2dclustering_jsp.java:115)

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:547)

at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1359)

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:1330)

at org.jivesoftware.util.LocaleFilter.doFilter(LocaleFilter.java:74)

at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1330)

at org.jivesoftware.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingF ilter.java:50)

at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1330)

at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:78)

at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1330)

at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:164)

at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1330)

at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:478)

at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)

at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:520)

at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:22 7)

at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:94 1)

at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:409)

at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:186 )

at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:875 )

at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)

at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandler Collection.java:250)

at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.jav a:149)

at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)

at org.eclipse.jetty.server.Server.handle(Server.java:349)

at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:441)

at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConne ction.java:919)

at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:582)

at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:218)

at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:51 )

at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.jav a:586)

at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java :44)

at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:598 )

at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:533)

at java.lang.Thread.run(Thread.java:744)

Caused by: java.lang.ClassNotFoundException: com.tangosol.net.Invocable

at java.net.URLClassLoader$1.run(URLClassLoader.java:366)

at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

at java.lang.ClassLoader.loadClass(ClassLoader.java:425)

at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

… 43 more