Hi, how i can export excel a pivot table with a custom query??

<?php
require APPPATH."/libraries/koolreport/autoload.php";
use \koolreport\processes\ColumnMeta;
use \koolreport\pivot\processes\Pivot;
use \koolreport\pivot\PivotExcelExport;
use \koolreport\processes\Map;
use \koolreport\processes\Limit;
use \koolreport\processes\Filter;
use \koolreport\cube\processes\Cube;

class ReporteGastos extends \koolreport\KoolReport
{
    use \koolreport\codeigniter\Friendship;
    use \koolreport\clients\Bootstrap;
    use \koolreport\export\Exportable;
    use \koolreport\excel\ExcelExportable;  
    
    function setup()
    {
        $plantas_gasolineras_empresa = array_unique($_SESSION['logged_in']['plantas_id_empresa']);
        $plantas_gasolineras_planta = $_SESSION['logged_in']['plantas_id_planta'];

        $query = "SELECT copd_id_cuenta_contable,
                         gept_nombre,
                         copd_cargo,
                         'SEMANA '||to_char(to_date(copd_fecha,'YYYYMMDD'),'w') semana
                FROM co_polizas_detalle 
                LEFT OUTER JOIN ge_plantas ON gept_id_planta = copd_id_planta AND copd_id_empresa = gept_id_empresa
                WHERE copd_id_planta IN :planta 
                AND   copd_fecha BETWEEN '20170101' AND '20170131' 
                AND   copd_id_empresa = 402 
                AND   copd_estatus='APL'
                AND   copd_id_cuenta_contable IN ('0104-0402-0402-0001') 
                ORDER BY copd_id_cuenta_contable, copd_id_planta, gept_nombre, semana";
                
        $this->src('a3_oracle')->query($query)
        ->params(array(
            ":planta"=>$plantas_gasolineras_planta,
            ":empresa"=>$plantas_gasolineras_empresa
        ))
        ->pipe(new ColumnMeta(array(
            'COPD_CARGO'=>array(
                'type' => 'number',
                'prefix' => '$',
                'decimals'=>2,
            ),
        )))
        ->pipe(new Pivot(array(
            "dimensions"=>array(
                "column"=>"SEMANA",
                "row" => "COPD_ID_CUENTA_CONTABLE, GEPT_NOMBRE, COPD_CARGO",
            ),
            "aggregates"=>array(
                "sum"=>"COPD_CARGO",
            )
        )))
        ->pipe($this->dataStore('co_polizas_detalle'));
    }
}

it create file excel but shows an error opening the file.

Me genera un renglón al inicio, lo que hace que no quiera abrir el archivo. Saludos!!