Rule inside a Rule in Web Rule Engine

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MVC

Hi All,

Suppose I have a rule
Rule1: Age is greater that 18
Rule2 : firstname starts with a
Now I am trying to create a rule 3: if rule 1 is true and rule 2 is true.

When I am trying to filter the result by the following code

IEnumerable<MemberCls> lst = objMemberCls.GetMemberList().Filter(rule);

It raises an exception as follows "Rule with id 'xxx' not found"

Below one is the entire code

public ActionResult Evaluate(MemberCls patient, RuleModel ruleEditor)
        {

            ruleEditor.BindSource(typeof(MemberCls));

            ruleEditor.SkipNameValidation = true;
            ViewBag.Rule = ruleEditor;

            if (ruleEditor.IsEmpty() || !ruleEditor.IsValid(StorageService.LoadRuleXml))
            {
                ViewBag.Message = "The rule is empty or invalid";
                return View("Index");
            }

            string rule = ruleEditor.GetRuleXml();

            Evaluator<membercls> evaluator = new Evaluator<membercls>(rule, StorageService.LoadRuleXml);
            bool success = true;

            Patient objPatient = new Patient();
            MemberCls objMemberCls = new MemberCls();
            if (success)
            {
                IEnumerable<membercls> lst = objMemberCls.GetMemberList().Filter(rule);
                objPatient.lstMember = lst.ToList();
            }

            ViewBag.Rule = RuleModel.Create(typeof(Patient));


            if (!string.IsNullOrWhiteSpace(patient.Output))
                ViewBag.Message = patient.Output;
            else
                ViewBag.Message = "The current rule evaluated to " + success;

            return View("Index", objPatient);
        }

Can I know How to resolve this issue?