‘Metadata contains a reference that cannot be resolved’ issue with CRM 2011 Online

Hi all , 

I am trying to Access CRM 2011 Online using Services in my custom application and I am facing the below errorwhen I call my Organizationserviceproxy

‘Metadata contains a reference that cannot be resolved’  PFB my code

OrganizationServiceProxy serviceProxy;
        ClientCredentials deviceCredentials = new ClientCredentials();
        ClientCredentials clientCredentials = new ClientCredentials();
        Uri OrganizationUri = new Uri(String.Format("<a href="https://<<>>/XRMServices/2011/Organization.svc">https://<<>>/XRMServices/2011/Organization.svc"));
        Uri HomeRealmUri = null;
        clientCredentials.UserName.UserName = "username";
        clientCredentials.UserName.Password = "password";

        deviceCredentials = DeviceIdManager.LoadDeviceCredentials();
        //deviceCredentials.UserName.UserName = "DId";
        //deviceCredentials.UserName.Password = "Dpw";
       
        //Using Organization Service Proxy to instantiate the CRM Web Service
        try
        {

        //  ServicePointManager.ServerCertificateValidationCallback = delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors SslPolicyErrors)
       //     {
       //            return true;
      //      };

            serviceProxy = new OrganizationServiceProxy(OrganizationUri, HomeRealmUri, clientCredentials, deviceCredentials);
            // This statement is required to enable early-bound type support.
            serviceProxy.ServiceConfiguration.CurrentServiceEndpoint.Behaviors.Add(new ProxyTypesBehavior());
            IOrganizationService service = (IOrganizationService)serviceProxy;
        }
        catch (Exception err) { }

Regards ,

Raga