[rules-users] No Such Field Error:DESCR in implementing ChangeSet

[srinivasasanda]

Hi,

I'm trying to implement CHANGESET.xml functinlaity through some example.Here
is my code
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();

//kbuilder.add(ResourceFactory.newUrlResource("file:d:\\rulestest\\changeset.xml"),
ResourceType.CHANGE_SET);

kbuilder.add(ResourceFactory.newUrlResource(
"file:d:\\rulestest\\changeset.xml"), ResourceType.CHANGE_SET
);

KnowledgeBuilderErrors errors = kbuilder.getErrors();

if (errors.size() > 0) {

for (KnowledgeBuilderError error: errors) {

System.
err.println(error);

But It is generating exception as
java.lang.NoSuchFieldError: DESCR

at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:539)

at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)

at com.sample.DroolsTest.readKnowledgeBase(DroolsTest.java:42)

at com.sample.DroolsTest.main(DroolsTest.java:24)

Im using guvnor 5.2..Could you please suggest me

Thanks

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