Dear Community,
 I configured CAS with Dspace-1.4.2, and i am getting following error, how
to solve it, please give your solution,

2008-06-20 14:28:29,228 ERROR org.dspace.eperson.CASAuthentication @
Unexpected exception caught
org.xml.sax.SAXParseException: Content is not allowed in prolog.
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown
Source)
    at
edu.yale.its.tp.cas.client.ServiceTicketValidator.validate(ServiceTicketValidator.java:221)
    at
org.dspace.eperson.CASAuthentication.validate(CASAuthentication.java:248)
    at
org.dspace.eperson.CASAuthentication.authenticate(CASAuthentication.java:137)
    at
org.dspace.eperson.AuthenticationManager.authenticateInternal(AuthenticationManager.java:200)
    at
org.dspace.eperson.AuthenticationManager.authenticateImplicit(AuthenticationManager.java:178)
    at
org.dspace.app.webui.util.Authenticate.startAuthentication(Authenticate.java:190)
    at
org.dspace.app.webui.filter.RegisteredOnlyFilter.doFilter(RegisteredOnlyFilter.java:94)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at
edu.yale.its.tp.cas.client.filter.CASFilter.doFilter(CASFilter.java:317)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
    at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    at java.lang.Thread.run(Thread.java:619)
2008-06-20 14:28:29,229 ERROR org.dspace.eperson.CASAuthentication @
Unexpected exception caught
javax.servlet.ServletException: org.xml.sax.SAXParseException: Content is
not allowed in prolog.
    at
org.dspace.eperson.CASAuthentication.validate(CASAuthentication.java:251)
    at
org.dspace.eperson.CASAuthentication.authenticate(CASAuthentication.java:137)
    at
org.dspace.eperson.AuthenticationManager.authenticateInternal(AuthenticationManager.java:200)
    at
org.dspace.eperson.AuthenticationManager.authenticateImplicit(AuthenticationManager.java:178)
    at
org.dspace.app.webui.util.Authenticate.startAuthentication(Authenticate.java:190)
    at
org.dspace.app.webui.filter.RegisteredOnlyFilter.doFilter(RegisteredOnlyFilter.java:94)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at
edu.yale.its.tp.cas.client.filter.CASFilter.doFilter(CASFilter.java:317)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
    at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    at java.lang.Thread.run(Thread.java:619)
Caused by: org.xml.sax.SAXParseException: Content is not allowed in prolog.
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown
Source)
    at
edu.yale.its.tp.cas.client.ServiceTicketValidator.validate(ServiceTicketValidator.java:221)
    at
org.dspace.eperson.CASAuthentication.validate(CASAuthentication.java:248)
    ... 20 more
2008-06-20 14:28:29,230 INFO  org.dspace.eperson.CASAuthentication @ CAS
server:  https://localhost:8443/cas/login
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