java.lang.RuntimeException: Unable to create XMLReader

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java.lang.RuntimeException: Unable to create XMLReader
at org.xml.sax.helpers.XMLReaderFactory.loadClass(XMLReaderFactory.java:189)
at org.jasig.cas.client.util.XmlUtils.getXmlReader(XmlUtils.java:42)
at org.jasig.cas.client.util.XmlUtils.getTextForElement(XmlUtils.java:116)
at org.jasig.cas.client.validation.Cas20ServiceTicketValidator.parseResponse(Cas20ServiceTicketValidator.java:75)
at net.bingosoft.acegi.providers.cas.ticketvalidator.JasigCasClientTicketValidator.confirmTicketValid(JasigCasClientTicketValidator.java:45)
at org.acegisecurity.providers.cas.CasAuthenticationProvider.authenticateNow(CasAuthenticationProvider.java:146)
at org.acegisecurity.providers.cas.CasAuthenticationProvider.authenticate(CasAuthenticationProvider.java:132)
at org.acegisecurity.providers.ProviderManager.doAuthentication(ProviderManager.java:195)
at org.acegisecurity.AbstractAuthenticationManager.authenticate(AbstractAuthenticationManager.java:45)
at org.acegisecurity.ui.cas.CasProcessingFilter.attemptAuthentication(CasProcessingFilter.java:76)
at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:211)
at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:286)
at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
at org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:149)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
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.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.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at java.lang.Thread.run(Thread.java:595)

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