Unable to access Am tracking UI

14/05/09 22:59:39 ERROR webapp.Dispatcher: error handling URI: /slideram
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.hadoop.yarn.webapp.Dispatcher.service(Dispatcher.java:153)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)
        at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178)
        at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
        at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62)
        at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:900)
        at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:834)
        at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:795)
        at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163)
        at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)
        at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)
        at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at org.apache.slider.server.appmaster.web.SliderAmIpFilter.doFilter(SliderAmIpFilter.java:128)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at org.apache.hadoop.http.HttpServer2$QuotingInputFilter.doFilter(HttpServer2.java:1192)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
        at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
        at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:326)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
        at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
        at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to org.apache.slider.core.registry.info.ServiceInstanceData
        at org.apache.slider.server.services.registry.SliderRegistryService.listInstancesByType(SliderRegistryService.java:58)
        at org.apache.slider.providers.agent.AgentProviderService.buildEndpointDetails(AgentProviderService.java:669)
        at org.apache.slider.providers.agent.AgentProviderService.buildMonitorDetails(AgentProviderService.java:654)
        at org.apache.slider.server.appmaster.web.view.IndexBlock.addProviderServiceOptions(IndexBlock.java:98)
        at org.apache.slider.server.appmaster.web.view.IndexBlock.doIndex(IndexBlock.java:76)
        at org.apache.slider.server.appmaster.web.view.IndexBlock.render(IndexBlock.java:56)
        at org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:66)
        at org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:76)
        at org.apache.hadoop.yarn.webapp.View.render(View.java:235)
        at org.apache.hadoop.yarn.webapp.view.HtmlPage$Page.subView(HtmlPage.java:49)
        at org.apache.hadoop.yarn.webapp.hamlet.HamletImpl$EImp._v(HamletImpl.java:117)
        at org.apache.hadoop.yarn.webapp.hamlet.Hamlet$TD._(Hamlet.java:845)
        at org.apache.hadoop.yarn.webapp.view.TwoColumnLayout.render(TwoColumnLayout.java:56)
        at org.apache.hadoop.yarn.webapp.view.HtmlPage.render(HtmlPage.java:82)
        at org.apache.hadoop.yarn.webapp.Controller.render(Controller.java:212)
        at org.apache.slider.server.appmaster.web.SliderAMController.index(SliderAMController.java:47)