[rules-users] code error

hello, when I execute this code rule "sample6" when act :activity( Type == 5) //nod: act.getNodeProperty() //nod.Property(key1: Key, value1:value) //nod.Property(key2: Key, value==value1) then System.out.println("deux clés ont la meme valeurs"); end error is affiiched Exception in thread "main" org.drools.rule.InvalidRulePackage: Unable to create Field Extractor for 'Type' at org.drools.rule.Package.checkValidity(Unknown Source) at org.drools.common.AbstractRuleBase.addPackage(Unknown Source) at org.drools.jsr94.rules.admin.RuleExecutionSetImpl.<init>(Unknown Source) at org.drools.jsr94.rules.admin.LocalRuleExecutionSetProviderImpl.createRuleExecutionSet(Unknown Source) at org.drools.jsr94.rules.admin.LocalRuleExecutionSetProviderImpl.createRuleExecutionSet(Unknown Source) at org.drools.jsr94.rules.admin.LocalRuleExecutionSetProviderImpl.createRuleExecutionSet(Unknown Source) at com.sample.Rule.fireRules(Rule.java:41) at com.sample.Rule.fireRules(Rule.java:70) at com.sample.DroolsTest.main(DroolsTest.java:59) however the attribut Type exist in class activity Best regard Thank you for your help --------------------------------- Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses.