AJAX request error - ASP. Net and JQuery

I have an aspx file where I created a script with an AJAX call to execute method populaGridMembros on table gwMembros , method is working perfectly and returning a string in JSON format, when I run $.ajax does not work, it goes into the code but does not and it jumps to the error. I would like help solving this problem.

ASPX:

<table id="gwdMembros" class="table table-condensed table-hover table-striped" data-selection="true" data-multi-select="true" data-row-select="true" data-keep-selection="true">
        <thead>
            <tr>
                <th data-column-id="NOME">Nome</th>
                <th data-column-id="SOBRENOME">Sobrenome</th>
                <th data-column-id="RG">RG</th>
                <th data-column-id="CPF">CPF</th>
            </tr>
        </thead>
        <tbody id="tabela">
        </tbody>
    </table>
 </div>

<script src="Scripts/jquery-1.11.1.min.js"></script>
<script src="Scripts/bootstrap.js"></script>
<script src="Scripts/jquery.bootgrid.js"></script>

<script>
    $(function () {
        $.ajax({
            url: "membros.aspx/populaGridMembros",
            type: "POST",
            dataType: "json",
            contentType: "application/json; charset=utf-8",
            data: {},
            success: function () {
                populaTabela(data);
            },
            error: function(XMLHttpRequest) {
                alert("Erro");
            }
        });
    });

    function populaTabela(dados) {
        var result = JSON.parse(dados);
        var out;
        for (var it = 0; it < result.length; it++) {
            out += "<tr><td>" + result[it].NOME + "</td></tr>" +
                    "<tr><td>" + result[it].SOBRENOME + "</td></tr>" +
                    "<tr><td>" + result[it].RG + "</td></tr>" +
                    "<tr><td>" + result[it].CPF + "</td></tr>";
        }

        document.getElementById("tabela").innerHTML = out;
    }

    $(function () {
        function init() {
            $("#gwMembros").bootgrid();
        }

        init();

        $("#init").on("click", init);
    });
</script>

In the aspx.cs of this file I have the following code:

public static string populaGridMembros()
    {
        modelo = new ModelGestaoEclesiasticaDataContext();

        try
        {
            var sourceMembros = from listMembros in modelo.TB_MEMBROs
                                select new
                                {
                                    NOME = listMembros.NOME,
                                    SOBRENOME = listMembros.SOBRENOME,
                                    RG = listMembros.RG,
                                    CPF = listMembros.CPF
                                };

            return JsonConvert.SerializeObject(sourceMembros);
        }
        catch (Exception)
        {
            throw;
        }
        finally
        {
            modelo.Dispose();
        }
    }

    protected void addMembro_Click(object sender, EventArgs e)
    {
        Response.Redirect("Cadastros/cadMembro.aspx");
    }

}
}