[rules-users] Drools and Guvnor 5.1M2 - Exception being thrown in processChangeSet

I am trying to upgrade to the 5.1M2 build from 5.0.1 and am running into some issues. I have installed the new 5.1 Guvnor and imported the rules from my 5.0.1 Guvnor instance. I then removed the old 5.0.1 drools jars from my app and replaced them with the 5.1M2 drools jars. I was also added all the dependent libraries. The code that worked with the 5.0.1 version does not work with the 5.1M2 version. In 5.0.1 I was constructing the xml and streaming it into the applyChangeSet method. With 5.1M2 I am just pointing to the change set xml file that is in the Guvnor. I am seeing a NullPointerException being thrown in the processChangeSet method as shown below. Caused by: java.lang.NullPointerException at org.drools.agent.impl.KnowledgeAgentImpl.processChangeSet(KnowledgeAgent Impl.java:171) at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentIm pl.java:143) at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentIm pl.java:130) Did I miss something? Am I doing something wrong? Below is the code that I have. KnowledgeAgentConfiguration kaconf = KnowledgeAgentFactory.newKnowledgeAgentConfiguration(); kaconf.setProperty( "drools.agent.scanDirectories", "true" ); kaconf.setProperty("drools.agent.newInstance", "false"); ResourceFactory.getResourceChangeScannerService().start(); ResourceFactory.getResourceChangeNotifierService().start(); String url = "http://rulerserver/drools-guvnor/org.drools.guvnor.Guvnor/package/my.ru le.package/LATEST/ChangeSet.xml"; KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent( "Configuration", kaconf ); kagent.setSystemEventListener(new MyDroolsListener()); try { kagent.applyChangeSet(ResourceFactory.newUrlResource(new URL(url))); // ERROR IS OCCURING INSIDE OF applyChangeSet } catch (MalformedURLException e) { e.printStackTrace(); }