LIST c# to WCF service not working -

i'm trying simple query tolist() return wcf service service returning error.

this have ordered first use last use:

[operationcontract] list<alertas> leeralerta();   public list<alertas> leeralerta()  {       return _pr.leeralerta();  } 

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 public list<alertas> leeralerta()  {       return _db.leeralerta();  } 

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  internal list<alertas> leeralerta()   {         using (var db = new alertas2015())        {            var alertas = db.alertas.tolist();             return alertas;         }      } 

and object alertas:

public partial class alertas {         public int id { get; set; }         public int modulos_id { get; set; }         public string proceso { get; set; }         public string metodo { get; set; }         public string descripcion { get; set; }         public int estado { get; set; }         public string receptor { get; set; }         public system.datetime fecha { get; set; }         public system.datetime fecha_aceptada { get; set; }          public virtual modulos modulos { get; set; } } 

the error i'm having when reading wcf service errorcode 10054 wcfstorm saying host has been closed.

what doing wrong?