Unable to transfer data from Infotable to Stream

Hi,

I want to transfer data from Infotable to  a Stream.

I tried this:

Thingame = "THGF_LPIPPO1";  

STREAM   = "THGF_LPIPPO1STREAM";

var grid = Things[Thingame].Cont_Grid;

var length  = grid.rows.length;

   for (var j=0;j<length;j++){

        var row = grid.rows;

// val:INFOTABLE(Datashape: DSHP_STREAMSTORICO)

       var val = Things[STREAM].CreateValues();

        val.ValoreBonus = row.ValoreBonus; //STRING

        val.NumGettoniErogati = row.NumGettoniErogati; //STRING

        val.CreditoIniziale = row.CreditoIniziale; //STRING

        val.FasciaOraria = row.FasciaOraria; //STRING

        val.TipoEvento = row.TipoEvento; //STRING

        val.ValoreRicaricato = row.ValoreRicaricato; //STRING

        val.Codice = row.Codice; //STRING

        val.NumGettBonus = row.NumGettBonus; //STRING

        val.Timestamp = row.Timestamp; //DATETIME

        val.PrezzoSelezione = row.PrezzoSelezione; //STRING

        val.NumSelezione = row.NumSelezione; //STRING

        val.CreditoInserito = row.CreditoInserito; //STRING

        val.Overpay = row.Overpay; //STRING

        val.MatricolaChiave = row.MatricolaChiave; //STRING

        val.RestoErogato = row.RestoErogato; //STRING

        var params =

       {

            values : val

        };

        Things[STREAM].AddStreamEntry(params);

    }

This worked but this script copy one row from the infotable to the Stream, in particular the oldest.

So I noticed this snippet:

var params = {

  values: grid    /* INFOTABLE */

};

// no return

Things["THGF_LPIPPO1STREAM"].AddStreamEntries(params);

but I have the following error:

Wrapped java.lang.NullPointerException Cause: null

Can you help me???

Thanks

Thingworx: 7.2.6