[rules-users] Problem creating package - validateUniqueRuleNames(PackageBuilder.java:830)

Following is my code: KnowledgeBuilderConfiguration kbc = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(); kbc.setProperty("drools.dialect.java.compiler", "JANINO"); KnowledgeBuilder builder = null; builder = KnowledgeBuilderFactory.newKnowledgeBuilder(kbc); Reader drlSource = new InputStreamReader(RVEngine.class.getResourceAsStream(ruleset.getDrlSourc e())); //ruleset.getDrlSource() = com/cit/myDrl.dslr Reader dslSource = new InputStreamReader(RVEngine.class.getResourceAsStream(ruleset.getDslSourc e())); builder.add(ResourceFactory.newReaderResource(dslSource), ResourceType.DSL); builder.add(ResourceFactory.newReaderResource(drlSource), ResourceType.DSLR); KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages(builder.getKnowledgePackages()); no matter what I type in my dslr (drl) file I get the following exception on the highlighted line; ANY IDEA???? I have 1 rule or No rule it still throws the same exception. Does it have to do with any jar files? Caused by: java.lang.NullPointerException at org.drools.compiler.PackageBuilder.validateUniqueRuleNames(PackageBuilde r.java:830) at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:555) at org.drools.compiler.PackageBuilder.addPackageFromDslr(PackageBuilder.jav a:355) at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.j ava:461) at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.ja va:28) saleem