[rules-users] error

Hello, when I EXECUTE my Rule an exception is affiched: org.drools.rule.InvalidRulePackage: Unable to create Field Extractor for 'lproject' Rule Compilation error $lproject cannot be resolved MYrules: rule "userrole1" when $Project : Project($name : name,$lproject : lproject) then $lproject.deleteRole("Buyer"); end et mon Java Bean: public class Project { private String Name ; private ProjectSession lproject; public Project(String Name, ProjectSession lproject) { setProject(Name); setlProject(lproject); } public void setProject(String Name) { this.Name=Name; } public String getName() { return this.Name; } public void setlProject(ProjectSession lproject) { this.lproject=lproject; } public ProjectSession getlProject() { return this.lproject; } } Please help me Best regards Ismail --------------------------------- 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.