Hello, i am trying to delete my rows on client side, with this code:

function arqGrid_Eliminar(idGrid, rowKey, eliminarKey, callingURL) {
    ShowInProgress()

    var grid = $find(idGrid);
    var parentGrid = grid.get_gridView();

    var numberOfRows = parentGrid.get_rows().get_length();

    var response = []
    var rowKey = rowKey;
    for (i = 0; i < numberOfRows; i = i + 1) {
        if (parentGrid.get_rows().get_row(i).get_cellByColumnKey(eliminarKey).get_value()) {
            var rowKeyValue = parentGrid.get_rows().get_row(i).get_dataKey()[0]
            response.push({ rowKey: rowKey, rowKeyValue: rowKeyValue })
        }
    }

    var object = { Deletes: response };
    var rows = []

    $.ajax({
        url: DIR_VIRTUAL + callingURL + '/Eliminar',
        type: "POST",
        dataType: "json",
        contentType: "application/json; charset=utf-8",
        data: JSON.stringify(object),
        cache: false,
        async: false,
        success: function (data) {
             for (i = 0; i < numberOfRows; i = i + 1) {
                if (parentGrid.get_rows().get_row(i).get_cellByColumnKey(eliminarKey).get_value()) {
                     var row = parentGrid.get_rows().get_row(i);
                     var rowKeyValue = row.get_dataKey()[0]
                     //Si no ha dado error se elimina
                     if (($.inArray(rowKeyValue.toString(), data.d) < 0)) {                      
                         //row._element.style.display = "none"

                           //parentGrid.get_rows().remove(row)

                       //parentGrid.get_behaviors().get_editingCore().get_behaviors().get_rowDeleting().deleteRows(row)

                     }
                           
                }
            }            
        },
        complete: function () {
            HideInProgress()
            //Muestra el mensaje resultado de la operacion, el cual habra sido guardado en sesión
            parent.MostrarMensaje()
        },
        error: function (jqXHR, textStatus, errorThrown) {
            HideInProgress();
            alert(textStatus)
        }
    });

    //Refresh Grid
    //var callbackObject = grid._callbackManager.createCallbackObject();
    //grid._callbackManager.execute(callbackObject);

    return false;   
 
}

The Ajax call deletes the row on database and on session.

but then when i made a post it shows a error message, i attached the snapshot to the post.

Regards, Juan