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java.lang.IllegalArgumentException: Can't convert argument: null	at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2719)	at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2745)	at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:1060)	at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)	at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1561)	at org.apache.catalina.startup.ContextConfig.applicationWebConfig(ContextConfig.java:339)	at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:1031)	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:255)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4053)	at org.apache.catalina.manager.ManagerServlet.start(ManagerServlet.java:1175)	at org.apache.catalina.manager.HTMLManagerServlet.start(HTMLManagerServlet.java:510)	at org.apache.catalina.manager.HTMLManagerServlet.doGet(HTMLManagerServlet.java:104)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)