visual studio - Windows Azure Error C#

我得到这个错误:

f: error_processar esta solicita_data_name = 0。| emSystem.Data.Services.Client.DataServiceContext.SaveResult.HandleBatchResponse ()新兴市场System.Data.Services.Client.DataServiceContext.SaveResult.EndRequest ()新兴市场System.Data.Services.Client.DataServiceContext.SaveChanges (SaveChangesOptions选项)新兴市场AzureTableLayer.CRUDUserEntities。ADDUSociate (UserClientEntity实体)na用户' ' WindowsAzureProject1 ' AzureTableLayer ' CRUDUserEntities.cs: linha43 em mobile.Service1。addusr(字符串名称，字符串名称，字符串名称)字符串email，字符串电话)na 'Service1.svc.cs:linha 124

方法是:

    public string addusr(string nome, string cidade, string cpf, string email, string telefone)
    {
        try
        {
            if (nome.Length == 0)
                return "f:Preencha o campo nome.";
            if (cidade.Length == 0)
                return "f:Preencha o campo cidade.";
            if (cpf.Length == 0)
                return "f:Preencha o campo cpf.";
            if (!Valida(cpf))
                return "f:CPF Invalido.";
            if (email.Length == 0)
                return "f:Preencha o campo email.";
            Regex rg = new Regex(@"^[A-Za-z0-9](([_'.'-]?[a-zA-Z0-9]+)*)@([A-Za-z0-9]+)((['.'-]?[a-zA-Z0-9]+)*)'.([A-Za-z]{2,})$");
            if (!rg.IsMatch(email))
            {
                return "f:Email Invalido";
            }
            List<UserEntity> lst = new List<UserEntity>();
            var _account = CloudStorageAccount.Parse(RoleEnvironment.GetConfigurationSettingValue("Conn"));
            _account.CreateCloudTableClient().CreateTableIfNotExist("fiscal");
            var _context = new CRUDUserEntities(_account.TableEndpoint.ToString(), _account.Credentials);

            UserClientEntity entity = new UserClientEntity() { nome = nome, cidade = cidade, cpf = cpf, email = email, telefone = telefone };
            _context.ADDUSociate(entity);
            return "k";
        }
        catch (Exception exc)
        {
            string error =  "f:" + exc.Message + "|" + exc.StackTrace;
           // Trace.WriteLine("Erro no login: " + error , "Information");
            return error;
        }
    }

addusassociate(我得到错误的地方)

 public void ADDUSociate(UserClientEntity entity)
  {
      this.AddObject("UserEntities", new UserEntity { nome = entity.nome, cpf = entity.cpf, cidade = entity.cidade, email = entity.email, telefone = entity.telefone});
      this.SaveChanges();
  }

编辑:问题出在this.SaveChanges();