Error occured when i call method in my web service(2)

Question

Hi,

I am currently developing a web service:

but when I call this method , this message is shown:

"This XML file does not seem to have any style information associated with it. " 

Please help me   

This is my code:

 [WebMethod]

        public FactureTopNet CreationFacture(  int NUM_FACTURE,  int NUM_JUR_FACT, int SOCIETE,  int TYPE, string LOGIN_CREATION, DateTime DATE_CREATION,  string LOGIN_MODIFICATION,  DateTime DATE_MODIFICATION,  Decimal MNT_FACT,  decimal REMISE,  decimal NET_PAYE, decimal REST_PAYE,  string OBSERV,  int ID_CLIENT, string REMARQUE,  string MONTANTTEXT, int TIMBRE,  int AVOIR,  int NUM_LISTE,  int ID_REV,  int NUM_PF,  int NUM_PP,  string REFERENCE,  string CLE,  int ID_COM,  decimal MONTANT_COM,  DateTime DATE_COM, int RED_COM,  int INTER_GROUPE)

        {

            System.Data.OleDb.OleDbConnection conn = new System.Data.OleDb.OleDbConnection();

            conn.ConnectionString = @"Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;User ID=topnet;Initial Catalog=TopnetBase;Data Source=SWEET-4B6F892B4\SQLEXPRESS";

            conn.Open();

            FactureTopNet facture = new FactureTopNet();

            int r;

            string req = "INSERT INTO facture (NUM_FACTURE, NUM_JUR_FACT, SOCIETE, TYPE, LOGIN_CREATION, DATE_CREATION,LOGIN_MODIFICATION,DATE_MODIFICATION,MNT_FACT, REMISE, NET_PAYE, REST_PAYE, OBSERV, ID_CLIENT, REMARQUE, MONTANTTEXT, TIMBRE, AVOIR,NUM_LISTE,ID_REV,NUM_PF,NUM_PP, REFERENCE, CLE, ID_COM,MONTANT_COM, DATE_COM, RED_COM, INTER_GROUPE)VALUES('" + NUM_FACTURE + "','" + NUM_JUR_FACT + "','" + SOCIETE + "','" + TYPE + "','" + LOGIN_CREATION + "','" +DATE_CREATION + "','" + LOGIN_MODIFICATION + "','" + DATE_MODIFICATION + "','" + MNT_FACT + "','" + REMISE + "','" + NET_PAYE + "','" + REST_PAYE + "','" + OBSERV + "','" + ID_CLIENT + "','" + REMARQUE + "','" + MONTANTTEXT + "','" + TIMBRE + "','" + AVOIR + "','" + NUM_LISTE + "','" + ID_REV + "','" + NUM_PF + "','" + NUM_PP + "','" + REFERENCE + "','" + CLE + "','" + ID_COM + "','" +MONTANT_COM + "','" + DATE_COM + "','" + RED_COM + "','" + INTER_GROUPE + "')";

            System.Data.OleDb.OleDbCommand command = new System.Data.OleDb.OleDbCommand(req, conn);

            r = command.ExecuteNonQuery();

            facture.NUM_FACTURE = NUM_FACTURE;

            facture.NUM_JUR_FACT = NUM_JUR_FACT;

           

            facture.SOCIETE = SOCIETE;

            facture.TYPE = TYPE;

            facture.LOGIN_CREATION = LOGIN_CREATION;

            facture.DATE_CREATION = DATE_CREATION;

            facture.LOGIN_MODIFICATION = LOGIN_MODIFICATION;

            facture.DATE_MODIFICATION = DATE_MODIFICATION;

            facture.MNT_FACT = MNT_FACT;

            facture.REMISE = REMISE;

            facture.NET_PAYE = NET_PAYE;

            facture.REST_PAYE = REST_PAYE;

            facture.OBSERV = OBSERV;

            facture.ID_CLIENT = ID_CLIENT;

            facture.REMARQUE = REMARQUE;

            facture.MONTANTTEXT = MONTANTTEXT;

            facture.TIMBRE = TIMBRE;

            facture.AVOIR = AVOIR;

            facture.NUM_LISTE = NUM_LISTE;

            facture.ID_REV = ID_CLIENT;

            facture.NUM_PF = NUM_PF;

            facture.NUM_PP = NUM_PP;

            facture.REFERENCE = REFERENCE;

            facture.CLE = CLE;

            facture.ID_COM = ID_COM;

            facture.MONTANT_COM = MONTANT_COM;

            facture.DATE_COM = DATE_COM;

            facture.RED_COM = RED_COM;

            facture.INTER_GROUPE = INTER_GROUPE;

            return facture;

            

            

            

        }