[rules-users] XmlDumper related problem

hi, i'm trying to implement the VISIT methods of XmlDumper class but it gives the errors like, no visitor implementation for : class org.drools.lang.descr.PatternDescr : org.drools.lang.descr.PatternDescr@1a758cb no visitor implementation for : class org.drools.lang.descr.PatternDescr : org.drools.lang.descr.PatternDescr@1a758cb java.lang.NullPointerException at org.drools.xml.XmlDumper.appendXmlDump(Unknown Source) at org.drools.xml.XmlDumper.visitPackageDescr(Unknown Source) at org.drools.examples.test2.main(test1.java:69) i cant understand why it is giving like... at org.drools.xml.XmlDumper.appendXmlDump(Unknown Source) at org.drools.xml.XmlDumper.visitPackageDescr(Unknown Source) i've the method like this, XmlDumper xmldumper = new XmlDumper(); xmldumper.visitPackageDescr(pdesc); where pdesc is the object of PackageDescr class.can anybody help me ? i dont know whether i am able to make you understand about my problem or not,if no then plz tell me what information you need.but plz provide me a solution,i need it urgently. thanking you, Niloy Debnath Student --------------------------------- Check out what you're missing if you're not on Yahoo! Messenger