I cannot enter the Success json function

Question

Dai galera.... I am unable to pass the return of my code to the function Success of my ajax via json.... I am using codeiginiter, php, mysql.... someone can help me.... it’s been almost a week that I’m trying and I don’t unpack...

My controller....

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Login extends CI_Controller {
function __construct() {
    parent::__construct();
}
public function index() {
    $dados['tituloPrincipal'] = 'Login';
    $this->load->view('Listar/login', $dados);
}
public function cadastroLogin() {
    $dados['nomeCliente'] = $this->input->post('nomeCliente');
    $dados['telefoneCliente'] = $this->input->post('telefoneCliente');
    $dados['senhaCliente'] = $this->input->post('senhaCliente');
    $dados['emailCliente'] = $this->input->post('emailCliente');
    $this->load->model("mLogin");
    $result = $this->mLogin->cadastrandoLogin($dados);
    $msg['success'] = false;
    if ($result) {
        $msg['success'] = true;
    }
    echo json_encode($msg);
}

}

My Model....

public function __construct()
{
    parent::__construct();
    $this->load->database();
}
public function cadastrandoLogin($dados = null) {
    if ($dados != null) {            
        $this->db->insert('clientes', $dados);
    }
    try {
        return true;
    } catch (Exception $exc) {
        return false;
    }
}

}

My script.....

$(function () {
$('#adicionarCliente').click(function () {
    var data = $('#cadastroCliente').serialize();
    if ((nomeCliente && emailCliente && telefoneCliente && senhaCliente) != null) {
        $.ajax({
            method: 'POST',
            url: '<?php echo base_url() ?>Login/cadastroLogin',
            data: data, //Dados
            async: false,
            dataType: 'json',
            success: function (response) {
                if (response.success) {
                    alert(response);
                    //ajax_redirect('<?php echo base_url() ?>Login');
                }
                else
                {
                    alert("Lasco");
                }
            },
            error: function () {
                alert('Lascado');
            }
        });
    }
});
});