Silverlight Web Service Error Crossdomain Policy

[ServiceContract]
    public interface IPolicyRetriever
    {
        [OperationContract, WebGet(UriTemplate = "/clientaccesspolicy.xml")]
        Stream GetSilverlightPolicy();
        [OperationContract, WebGet(UriTemplate = "/crossdomain.xml")]
        Stream GetFlashPolicy();
    }

public class Service1 : IService1, IPolicyRetriever
    {
#region [ IPolicyRetriever Members ]
        Stream StringToStream(string result)
        {
            WebOperationContext.Current.OutgoingResponse.ContentType = "application/xml";
            return new MemoryStream(Encoding.UTF8.GetBytes(result));
        }
        public Stream GetSilverlightPolicy()
        {
            string result = @"<?xml version=""1.0"" encoding=""utf-8""?>
                                <access-policy>
                                    <cross-domain-access>
                                        <policy>
                                            <allow-from http-request-headers=""*"">
                                                <domain uri=""*""/>
                                            </allow-from>
                                            <grant-to>
                                                <resource path=""/"" include-subpaths=""true""/>
                                            </grant-to>
                                        </policy>
                                    </cross-domain-access>
                                </access-policy>";
            return StringToStream(result);
        }
        public Stream GetFlashPolicy()
        {
            string result = @"<?xml version=""1.0""?>
                            <!DOCTYPE cross-domain-policy SYSTEM ""http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd"">
                            <cross-domain-policy>
                                <allow-access-from domain=""*"" />
                            </cross-domain-policy>";
            return StringToStream(result);
        }
        #endregion
}