Bindingsource add row

I have a Dataset ( a master and a detail tables), a Bindingsource (Detail Table "Horarios") and a Tableadapter linked to a datagrid.

When I try to add a row to the table the next error occurs:
"Objects added to a list of bindingsource be all of the same type"

Code:

---

           

private void btnCrear_Click(object sender, EventArgs e)
        {

            DataRow NuevoHorarioRow = seguridadDataSetFestivos.Tables["Horarios"].NewRow();
           
            NuevoHorarioRow[0] = cbCuenta.SelectedValue;                   
            NuevoHorarioRow[1] = cbTipo.SelectedIndex;     
            string sHora = cbHora.SelectedIndex.ToString();

            foreach (int indCheck in ckDias.CheckedIndices)
            {
                int j = 2 + indCheck;                     
                NuevoHorarioRow[j] = System.Convert.ToDateTime(sHora);
            }
           
            try
            {
                this.horariosBindingSource.Add(NuevoHorarioRow);
            }
            catch (Exception ex)
            {
                MessageBox.Show("ERROR: \n" + ex.Message, "", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);
            }
.....


---

Also, I have tried with only the first field (Integer, primary key) and the other null.

The fields of the table are:
0: Int
1: Int
2 to 9: smalldatetime

Thanks for any orientation.

what is the data source of "horariosBindingSource"?

The datasource is "SeguridadDataset" which contains the master table "Cuentas" and "Horarios". In this last is where I need to add a new row.

May be you should try to binding only one tables...