[rules-users] Error in setting up Guvnor in tomcat 6

[drools newbie]

Hello,
I followed the instructions given in
http://www.jboss.org/community/docs/DOC-10130.  But getting following error.
Please someone help.

INFO: Deploying web application archive mydrools-guvnor.war
Oct 28, 2008 9:48:24 AM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
Oct 28, 2008 9:48:24 AM org.apache.catalina.core.StandardContext start
SEVERE: Context [/mydrools-guvnor] startup failed due to previous errors
Oct 28, 2008 9:48:25 AM org.apache.catalina.loader.WebappClassLoader
loadClass
INFO: Illegal access: this web application instance has been stopped
already.  C
ould not load org.apache.xerces.impl.dtd.XMLNotationDecl.  The eventual
followin
g stack trace is caused by an error thrown for debugging purposes as well as
to
attempt to terminate the thread which caused the illegal access, and has no
func
tional impact.
java.lang.IllegalStateException
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoa
der.java:1273)
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoa
der.java:1233)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at org.apache.xerces.impl.dtd.DTDGrammar.notationDecl(Unknown
Source)
        at org.apache.xerces.impl.dtd.XMLDTDProcessor.notationDecl(Unknown
Sourc
e)
        at org.apache.xerces.impl.XMLDTDScannerImpl.scanNotationDecl(Unknown
Sou
rce)
        at org.apache.xerces.impl.XMLDTDScannerImpl.scanDecls(Unknown
Source)
        at
org.apache.xerces.impl.XMLDTDScannerImpl.scanDTDExternalSubset(Unknow
n Source)

-----
Oct 28, 2008 9:48:25 AM org.apache.catalina.startup.HostConfig
deployDirectory
SEVERE: Error deploying web application directory examples
java.lang.NoClassDefFoundError: org/apache/xerces/impl/dtd/XMLNotationDecl
        at org.apache.xerces.impl.dtd.DTDGrammar.notationDecl(Unknown
Source)
        at org.apache.xerces.impl.dtd.XMLDTDProcessor.notationDecl(Unknown
Sourc
e)
        at org.apache.xerces.impl.XMLDTDScannerImpl.scanNotationDecl(Unknown
Sou
rce)
        at org.apache.xerces.impl.XMLDTDScannerImpl.scanDecls(Unknown
Source)
        at
org.apache.xerces.impl.XMLDTDScannerImpl.scanDTDExternalSubset(Unknow
n Source)
        at
org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(
Unknown Source)
        at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Un
known 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)


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