Hi there, I am trying load the example package mortgages with / KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent( "MortgageAgent" ); kagent.applyChangeSet( ResourceFactory.newUrlResource( " http://localhost:8080/guvnor-webapp/org.drools.guvnor.Guvnor/package/mort... " ) ); KnowledgeBase kbase = kagent.getKnowledgeBase();/ the execution of the "applyChangeSet" produces the error: /java.lang.RuntimeException: KnowledgeAgent exception while trying to deserialize KnowledgeDefinitionsPackage at org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:732) at org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:965) at org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:774) at org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:646) at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:190) at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:172) at com.sample.DroolsTest.main(DroolsTest.java:42) Caused by: java.io.InvalidClassException: org.drools.rule.MVELDialectRuntimeData; local class incompatible: stream classdesc serialVersionUID = 5166066541265170937, local class serialVersionUID = 8808844570772337501 at java.io.ObjectStreamClass.initNonProxy(Unknown Source) / I suppose it is a problem with different versions of any library, but I do not know which one, I think I have the latest version of all libraries ... My development environment: Server: Apache Tomcat 6.0.26 Guvnor server Version 5.2.0.Final Client: Eclipse 3.5 Galileo Java jre6 mvel2.jar version 2.0.19 drools-api.jar Bundle-Version: 5.2.0.SNAPSHOT drools-core.jar Bundle-Version: 5.2.0.SNAPSHOT Thanks in advance. -- View this message in context: http://drools.46999.n3.nabble.com/ERROR-stream-classdesc-serialVersionUID... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users