[rules-users] error while running a dsl

Hello, I have written the following simple DSL in Drools: [when]employee belongs to a particular state{state}=$employee:employee (statename=="{state}"); [then]Greet Employee=System.out.println("Hello"); I have also created the corresponding model with a field named "state". When I try to create business rule for the same and when I validate the rule I get the following error: Unable to create Field Extractor for 'statename' of '[ClassObjectType class=dslDemoPackage.employee]' in rule 'testdsl' Let me know how I can resolve. Best Regards, Kripa ________________________________ This Email may contain confidential or privileged information for the intended recipient (s) If you are not the intended recipient, please do not use or disseminate the information, notify the sender and delete it from your system. ______________________________________________________________________