[rules-users] RuntimeDroolsException: Unable to load dialect

Hi, I am trying to run Drools on Netbeans. I have added the jars from Drools 4.0.2. However, I encountered an error org.doxa.rules.RulesManager - org.drools.RuntimeDroolsException: Unable to load dialect ' org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration:mvel' I did not use any MVEL dialects in my rules definition. Here is my rule: * rule* "Out of Range" *when * m : Message( message == "checkRange" , status == 1 ) Range(myMin : myMin, myMax : myMax, myValue : myValue) Range(myValue < myMin || myValue > myMax) *then* m.setMessage(""); m.setStatus(0); *end * Has anyone attempted using Netbeans with Drools and faced this problem? Best regards Eric