Sitemap plugin when visiting the sitemap java.lang.NoClassDefFoundError is logged and you get a Server Error

When following the steps from the installation page [1] and going to the sitemap page [2], you get a server error and a severe error is logged: java.lang.NoClassDefFoundError [3]

[1] http://sitemap.forge.onehippo.org/usage.html
[2] http://localhost:8080/site/sitemap.xml
[3][INFO] [talledLocalContainer] Jul 04, 2014 4:13:35 PM org.apache.catalina.core.StandardWrapperValve invoke
[INFO] [talledLocalContainer] SEVERE: Servlet.service() for servlet [default] in context with path [/site] threw exception [Filter execution threw an exception] with root cause
[INFO] [talledLocalContainer] java.lang.NoClassDefFoundError: org/onehippo/forge/sitemap/components/model/SiteMapCharacterEscapeHandler
[INFO] [talledLocalContainer] at org.onehippo.forge.sitemap.generator.SitemapGenerator.toString(SitemapGenerator.java:166)
[INFO] [talledLocalContainer] at org.onehippo.forge.sitemap.generator.SitemapGenerator.createSitemap(SitemapGenerator.java:123)
[INFO] [talledLocalContainer] at org.onehippo.forge.sitemap.components.SitemapFeed.doBeforeRender(SitemapFeed.java:37)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstComponentInvokerImpl.invokeBeforeRender(HstComponentInvokerImpl.java:128)
[INFO] [talledLocalContainer] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[INFO] [talledLocalContainer] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[INFO] [talledLocalContainer] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO] [talledLocalContainer] at java.lang.reflect.Method.invoke(Method.java:606)
[INFO] [talledLocalContainer] at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
[INFO] [talledLocalContainer] at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
[INFO] [talledLocalContainer] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
[INFO] [talledLocalContainer] at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:80)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.PersistableSessionAroundAdvice.invoke(PersistableSessionAroundAdvice.java:68)
[INFO] [talledLocalContainer] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[INFO] [talledLocalContainer] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[INFO] [talledLocalContainer] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO] [talledLocalContainer] at java.lang.reflect.Method.invoke(Method.java:606)
[INFO] [talledLocalContainer] at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:621)
[INFO] [talledLocalContainer] at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:610)
[INFO] [talledLocalContainer] at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:65)
[INFO] [talledLocalContainer] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
[INFO] [talledLocalContainer] at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:80)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.logging.HstComponentInvokerProfiler.profile(HstComponentInvokerProfiler.java:60)
[INFO] [talledLocalContainer] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[INFO] [talledLocalContainer] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[INFO] [talledLocalContainer] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO] [talledLocalContainer] at java.lang.reflect.Method.invoke(Method.java:606)
[INFO] [talledLocalContainer] at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:621)
[INFO] [talledLocalContainer] at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:610)
[INFO] [talledLocalContainer] at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:65)
[INFO] [talledLocalContainer] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
[INFO] [talledLocalContainer] at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
[INFO] [talledLocalContainer] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
[INFO] [talledLocalContainer] at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
[INFO] [talledLocalContainer] at com.sun.proxy.$Proxy20.invokeBeforeRender(Unknown Source)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.AggregationValve.processWindowsBeforeRender(AggregationValve.java:398)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.AggregationValve.invoke(AggregationValve.java:132)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.ComponentRenderingValve.invoke(ComponentRenderingValve.java:36)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.PageCachingValve.invoke(PageCachingValve.java:64)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.ESIPageInfoScanningValve.invoke(ESIPageInfoScanningValve.java:79)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.PageInfoRenderingValve.invoke(PageInfoRenderingValve.java:50)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.ResourceServingValve.invoke(ResourceServingValve.java:42)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.ActionValve.invoke(ActionValve.java:48)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.SiteMenusResolvingValve.invoke(SiteMenusResolvingValve.java:33)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.JCRSessionStatefulConcurrencyValve.invoke(JCRSessionStatefulConcurrencyValve.java:56)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.SubjectBasedSessionValve.invoke(SubjectBasedSessionValve.java:58)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.SecurityValve.invoke(SecurityValve.java:158)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.LocalizationValve.invoke(LocalizationValve.java:96)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.ContextResolvingValve.invoke(ContextResolvingValve.java:60)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.CmsSecurityValve.invoke(CmsSecurityValve.java:79)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.InitializationValve.invoke(InitializationValve.java:72)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:271)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline.invokeValves(HstSitePipeline.java:170)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstSitePipeline.invoke(HstSitePipeline.java:153)
[INFO] [talledLocalContainer] at org.hippoecm.hst.core.container.HstRequestProcessorImpl.processRequest(HstRequestProcessorImpl.java:79)
[INFO] [talledLocalContainer] at org.hippoecm.hst.container.HstFilter.processResolvedSiteMapItem(HstFilter.java:829)
[INFO] [talledLocalContainer] at org.hippoecm.hst.container.HstFilter.doFilter(HstFilter.java:464)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
[INFO] [talledLocalContainer] at org.hippoecm.hst.container.XSSUrlFilter.doFilter(XSSUrlFilter.java:49)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
[INFO] [talledLocalContainer] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
[INFO] [talledLocalContainer] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
[INFO] [talledLocalContainer] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
[INFO] [talledLocalContainer] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
[INFO] [talledLocalContainer] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
[INFO] [talledLocalContainer] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
[INFO] [talledLocalContainer] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
[INFO] [talledLocalContainer] at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
[INFO] [talledLocalContainer] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
[INFO] [talledLocalContainer] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
[INFO] [talledLocalContainer] at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
[INFO] [talledLocalContainer] at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
[INFO] [talledLocalContainer] at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
[INFO] [talledLocalContainer] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
[INFO] [talledLocalContainer] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
[INFO] [talledLocalContainer] at java.lang.Thread.run(Thread.java:724)
[INFO] [talledLocalContainer]