aaData returned from server not bind on DataTable

Hello,

I have a code (Javascript + C # + ASP.NET MVC 4) to perform an ajax call to the server and return an array with the information for the operation of the datatables. When executing the call to the server, everything happens normally and the response is generated and sent to the client. However, the datatables does not reload the new information. He remains empty with no results. There is no error in the request or response. There is no error in the formatting of the JSON response.

I researched several posts in the forum and not found a similar problem. I searched the documentation and several internet sites before posting here. I would like a little help to try to solve this problem which I can not find solution.

Below is code

Table Code

<table id="tabela-pesquisa-grupo-empresarial" class="tabela-pesquisa">
	<thead>
		<tr>
			<th class="td-width-40px"><input type="checkbox" name="check_All" value="" /></th>
			<th class="td-width-10">Código Grupo</th>
			<th >Descricao</th>
		</tr>
	</thead>
	<tbody>
		
	</tbody>
</table>

$('#tabela-pesquisa-grupo-empresarial').dataTable({
        "sPaginationType": "full_numbers",
        "bJQueryUI": false,
        "bAutoWidth": false,
        "bLengthChange": false,
        "bFilter": false,
        "bProcessing": true,
        "bServerSide": true,
        "sAjaxSource": "GrupoEmpresarial/Pesquisar",
        "sServerMethod": "POST",
        "aoColumns": [
            {   "bSortable": false,
                "bSearchable": false },            
			{ "mDataProp": "IDGrupoEmpresarial" },
			{ "mDataProp": "Descricao" }			
        ],
        "aoColumnDefs": [
            { "sClass": "dt-column-align td-width-80", "aTargets": [2] }
        ],              
        "fnServerData": function (sSource, aoData, fnCallback, oSettings) {
            oSettings.jqXHR = $.ajax({
                "dataType": 'json',
                "contentType": "application/json; charset=utf-8",
                "type": "POST",
                "url": sSource,
                "data": GetDataPesquisa(aoData, oSettings),
                "success": fnCallback
            });
        }
    });

Below is the JSON returned

{ "aaData" : [ { "Descricao" : "Grupo Teste 02",
        "IDGrupoEmpresarial" : 2
      },
      { "Descricao" : "Grupo Teste 03",
        "IDGrupoEmpresarial" : 3
      }     
    ],
  "iTotalDisplayRecords" : 2,
  "iTotalRecords" : 2,
  "sEcho" : 1,
  "success" : true
}