drools-all produces error

using drools-all gives the error:
fibonacci-java:
[java] Using drl: fibonacci.java.drl
[java] org.xml.sax.SAXParseException: <parameter> has an invalid parent element
[java] at org.drools.io.RuleSetReader.validate(RuleSetReader.java:640)
[java] at org.drools.io.RuleSetReader.startElement(RuleSetReader.java:536)
[java] at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
[java] at org.apache.xerces.impl.xs.XMLSchemaValidator.startElement(Unknown Source)
[java] at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
[java] at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
[java] at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
[java] at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[java] at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[java] at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
[java] at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
[java] at javax.xml.parsers.SAXParser.parse(SAXParser.java:375)
[java] at org.drools.io.RuleSetReader.read(RuleSetReader.java:439)
[java] at org.drools.io.RuleSetReader.read(RuleSetReader.java:308)
[java] at org.drools.io.RuleBaseLoader.loadFromUrl(RuleBaseLoader.java:155)
[java] at org.drools.io.RuleBaseLoader.loadFromUrl(RuleBaseLoader.java:115)
[java] at org.drools.io.RuleBaseLoader.loadFromUrl(RuleBaseLoader.java:100)
[java] at org.drools.examples.fibonacci.FibonacciExample.main(FibonacciExample.java:61)
BUILD SUCCESSFUL
Total time: 9 seconds
Finished at: Tue Feb 22 01:18:10 CET 2005