[rules-users] StreamCorruptedException - invalid stream header

Hi, I'm experiencing an interesting issue with Drools/Guvnor. I am running Drools 5.1.1 on my workstation and the Guvnor 5.1.1 standalone locally. When I run it locally, it works fine. The server installation of JBoss AS was downloaded and installed at the same time as Drools 5.1.1. When I try to run it connecting to the remote server (on Linux), I get the following error: [2010:12:361 09:12:910:debug] KnowledgeAgent rebuilding KnowledgeBase using ChangeSet [2010:12:361 09:12:972:exception] java.lang.RuntimeException: KnowledgeAgent exception while trying to deserialize KnowledgeDefinitionsPackage at org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(Knowl edgeAgentImpl.java:664) at org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(Kno wledgeAgentImpl.java:889) at org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgent Impl.java:704) at org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAge ntImpl.java:584) at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentIm pl.java:185) at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentIm pl.java:168) at com.agencyawards2.RuleSessionProviderFactory.getSessionFactory(RuleSessi onProviderFactory.java:95) at com.agencyawards2.RuleSessionProviderFactory.getProvider(RuleSessionProv iderFactory.java:35) at com.agencyawards2.RunRules.runRules(RunRules.java:27) at com.agencyawards2.DroolsTest.main(DroolsTest.java:40) Caused by: java.io.StreamCorruptedException: invalid stream header: 7061636B at java.io.ObjectInputStream.readStreamHeader(Unknown Source) at java.io.ObjectInputStream.<init>(Unknown Source) at org.drools.common.DroolsObjectInputStream.<init>(DroolsObjectInputStream .java:71) at org.drools.core.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:2 05) at org.drools.core.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:1 74) at org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(Knowl edgeAgentImpl.java:653) ... 9 more [2010:12:361 09:12:03:debug] KnowledgeAgent obtaining pkg resource=[UrlResource path='file:src/main/rules/ruleflow.rf'] The only thing I can think of that is different is that I recently upgraded my Guvnor 5.0.1 to 5.1.1 on the Server. I did this by replacing the drools-guvnor.war with the newer version. Did that create some sort of compatibility between my local 5.1.1 installation and the server installation of 5.1.1 on top of the old 5.0.1? Thanks, John