Tomcat problem

[Przemyslaw Wegrzyn <czajnik@tower.t16.ds.pwr.wroc.pl>]

I get the following exception starting tomcat. What can cause this error ?
Tomcat starts and seems to work (at least exampels work properly)

TIA

-=Czaj-nick=-
 

Starting tomcat. Check logs/tomcat.log for error messages
org.apache.xerces.validators.datatype.InvalidDatatypeFacetException: org/apache/xerces/utils/regex/ParserForXMLSchema
        at
org.apache.xerces.validators.datatype.DatatypeValidatorFactoryImpl.createDatatypeValidator(DatatypeValidatorFactoryImpl.java)
        at
org.apache.xerces.validators.datatype.DatatypeValidatorFactoryImpl.createDatatypeValidator(DatatypeValidatorFactoryImpl.java)
        at
org.apache.xerces.validators.datatype.DatatypeValidatorFactoryImpl.initializeDTDRegistry(DatatypeValidatorFactoryImpl.java)
        at
org.apache.xerces.validators.common.XMLValidator.initDataTypeValidators(XMLValidator.java)
        at
org.apache.xerces.validators.common.XMLValidator.setValidationEnabled(XMLValidator.java)
        at
org.apache.xerces.framework.XMLParser.setValidation(XMLParser.java)
        at
org.apache.xerces.framework.XMLParser.setFeature(XMLParser.java)
        at org.apache.xerces.parsers.SAXParser.setFeature(SAXParser.java)
        at org.apache.xerces.jaxp.SAXParserImpl.<init>(SAXParserImpl.java)
        at
org.apache.xerces.jaxp.SAXParserFactoryImpl.newSAXParser(SAXParserFactoryImpl.java)
        at org.apache.tomcat.util.xml.XmlMapper.readXml(XmlMapper.java)
        at
org.apache.tomcat.context.WebXmlReader.processWebXmlFile(WebXmlReader.java)
        at
org.apache.tomcat.context.WebXmlReader.contextInit(WebXmlReader.java)
        at
org.apache.tomcat.core.ContextManager.initContext(ContextManager.java)
        at org.apache.tomcat.core.ContextManager.init(ContextManager.java)
        at org.apache.tomcat.startup.Tomcat.execute(Tomcat.java)
        at org.apache.tomcat.startup.Tomcat.main(Tomcat.java)