.net profile validations FHIR

[pritam malunjkar]

  var source = new CachedResolver(new MultiResolver(new DirectorySource(profileDirectory), ZipSource.CreateValidationSource()));

            var ctx = new ValidationSettings()
            {
                ResourceResolver = source,
                GenerateSnapshot = true,
                EnableXsdValidation = true,
                Trace = true,
                ResolveExternalReferences = true,
            };


            var validator = new Validator(ctx);
            var results = validator.Validate(patient);
            if(!results.Success)
            {
               
                //results = validator.Validate(patient, "https://nrces.in/ndhm/fhir/r4/StructureDefinition/Patient");
                results = validator.Validate(patient, "http://hl7.org/fhir/StructureDefinition/Patient");
                Console.WriteLine(results);
            }

I am getting Error in this --

{"Overall result: FAILURE (2 errors and 0 warnings)\r\n[ERROR] Unable to resolve reference to profile 'http://hl7.org/fhir/StructureDefinition/Patient' (at Patient)\r\n[ERROR] Unable to resolve reference to profile 'http://hl7.org/fhir/StructureDefinition/Patient'' (at Patient)\r\n"}

Kindly Guide me