Jboss web 3.0 Beta error

Version 1

    When I tried to start jboss web:

     

    It is missing lib xercesImpl.jar. After downloading it and put in lib directory, Then I got the following exception:

     

    Caused by: org.jboss.xb.binding.JBossXBRuntimeException: -1:-1 -1:-1 schema_reference.4: Failed to read schema document
    'null', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
            at org.jboss.xb.binding.sunday.unmarshalling.XsdBinderTerminatingErrorHandler.handleError(XsdBinderTerminatingErrorHandler.java:40) [jbossxb.jar:2.0.2.Beta6]
            at org.apache.xerces.impl.xs.XMLSchemaLoader.reportDOMFatalError(Unknown Source) [xercesImpl.jar:]
            at org.apache.xerces.impl.xs.XSLoaderImpl.load(Unknown Source) [xercesImpl.jar:]
            at org.jboss.xb.binding.Util.loadSchema(Util.java:394) [jbossxb.jar:2.0.2.Beta6]
            at org.jboss.xb.binding.sunday.unmarshalling.XsdBinder.bind(XsdBinder.java:178) [jbossxb.jar:2.0.2.Beta6]
            at org.jboss.xb.binding.sunday.unmarshalling.XsdBinder.bind(XsdBinder.java:149) [jbossxb.jar:2.0.2.Beta6]
            at org.jboss.xb.binding.resolver.AbstractMutableSchemaResolver.resolve(AbstractMutableSchemaResolver.java:339) [
    jbossxb.jar:2.0.2.Beta6]        ... 61 more

     

    Which xml file has problem? I checked all xml files and they have defined schema.Thanks for help.

    Dave