[opencms-dev] The sitemap failed to load, check the log file for further details.

[Schendel, Andreas]

Hello,
since the update from opencms 9.5.0 to 9.5.3 I got an error opening the sitemap:
" The sitemap failed to load, check the log file for further details."

Log:
19 Apr 2016 10:44:40,537 ERROR [ org.opencms.gwt.CmsGwtService: 184]
java.lang.NullPointerException
        at org.opencms.workplace.CmsWorkplaceMessages.getResourceTypeDescription(CmsWorkplaceMessages.java:144)
        at org.opencms.ade.sitemap.CmsVfsSitemapService.createResourceTypeInfo(CmsVfsSitemapService.java:1745)
        at org.opencms.ade.sitemap.CmsVfsSitemapService.getResourceTypeInfos(CmsVfsSitemapService.java:2260)
        at org.opencms.ade.sitemap.CmsVfsSitemapService.prefetch(CmsVfsSitemapService.java:754)
        at org.opencms.ade.sitemap.CmsVfsSitemapService.prefetch(CmsVfsSitemapService.java:297)
        at org.opencms.ade.sitemap.CmsSitemapActionElement.getSitemapData(CmsSitemapActionElement.java:117)
        at org.opencms.ade.sitemap.CmsSitemapActionElement.export(CmsSitemapActionElement.java:80)
        at org.opencms.ade.sitemap.CmsSitemapActionElement.exportAll(CmsSitemapActionElement.java:98)
        at org.apache.jsp.WEB_002dINF.jsp.offline.system.modules.org_opencms_ade_sitemap.pages.sitemap_jsp._jspService(sitemap_jsp.java:74)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748)
        at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:604)
        at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:543)
        at org.opencms.flex.CmsFlexRequestDispatcher.includeExternal(CmsFlexRequestDispatcher.java:191)
        at org.opencms.flex.CmsFlexRequestDispatcher.include(CmsFlexRequestDispatcher.java:165)
        at org.opencms.loader.CmsJspLoader.service(CmsJspLoader.java:643)
        at org.opencms.flex.CmsFlexRequestDispatcher.includeInternalWithCache(CmsFlexRequestDispatcher.java:441)
        at org.opencms.flex.CmsFlexRequestDispatcher.include(CmsFlexRequestDispatcher.java:169)
        at org.opencms.loader.CmsJspLoader.dispatchJsp(CmsJspLoader.java:937)
        at org.opencms.loader.CmsJspLoader.load(CmsJspLoader.java:523)
        at org.opencms.loader.CmsResourceManager.loadResource(CmsResourceManager.java:1191)
        at org.opencms.main.OpenCmsCore.showResource(OpenCmsCore.java:1733)
        at org.opencms.main.OpenCmsServlet.doGet(OpenCmsServlet.java:159)
        at org.opencms.main.OpenCmsServlet.doPost(OpenCmsServlet.java:175)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at com.dcampus.opencms.web.UriRewriteFilter.doFilter(UriRewriteFilter.java:49)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)



Any ideas how I can fix that?