Error generating excel with PHPExcel

I have a generic method that is responsible for generating the excel I need, what I send to the method is the resource of a query, the method is responsible for tracing the result to generate the excel with culumnas and corresponding rows.

As I mentioned several excel files of different queries, and today I am generating one more, the problem is that when I generate the excel at the beginning of the excel I attach a blank space or rather a blank line \ n, and this causes that the file with the office package is not visualized

So start the excel before this line there is a blank line,

PK    FušJG’D²X  ð     [Content_Types].xml­”MNÃ0…÷œ"ò%nY „švAa  •(0ö¤±êØ–gúw{&i‰@ÕnbEö{ßøyìÑdÛ¸l

In hexadecimal code, already identify the character

0d0a

I already researched about the character and what I found was what I mentioned in a bank line \ n or a new line that in PHP is PHP_EOL

var_dump(urlencode(PHP_EOL)); ?> 

Result: '%0D%0A'

And that's my code:

 <?php
   $parametro1 =  isset($_GET['a'])?$_REQUEST['a']:date('Y-m');
$parametro2 = isset($_REQUEST['b'])?$_REQUEST['b']:0;
$parametro3 = isset($_REQUEST['c'])?$_REQUEST['c']:0;
$parametro4 = isset($_REQUEST['d'])?$_REQUEST['d']:0;
$parametro5 = isset($_REQUEST['e'])?$_REQUEST['e']:0;
$parametro6 = $_REQUEST['f'];

$parametro7=$_GET['param'];

session_start();

require 'Datos.class.php';
require_once '../../../php/lib/PHPExcel/generarExcel.php';

$datos=Datos::getInstance();

$resultado = $datos->QueryExcel($parametro1,$parametro2,$parametro3,$parametro4,$parametro5,$parametro6);

GeneraExcel($resultado, 'TITULOEXCEL', $_SESSION['nombre'],'NombredelArchivo');

GeneraExcel is a method that is responsible for traversing the resource, it is already implemented and works correctly for all the excel that I generate except for this new one.

And the line that is added to my file automatically and I do not add it in my code at any time, I do not know where it comes from.

Maybe it's something very simple that I'm letting go through there.

Annex the method of GeneraExcel

<?php
/**
 * [$ruta description]Gnerar Excel
 * @var null
 */
function GeneraExcel($result, $tituloReporte, $usuario, $nombreArchivo)
{
    if (mysql_num_rows($result) > 0)
    {
        date_default_timezone_set('America/Mexico_City');
        if (PHP_SAPI == 'cli')
            die('Este archivo solo se puede ver desde un navegador web');
        /** Se agrega la libreria PHPExcel */
        require_once 'PHPExcel.php';
        // Se crea el objeto PHPExcel
        $objPHPExcel = new PHPExcel();
        // Se asignan las propiedades del libro
        $objPHPExcel->getProperties()->setCreator($usuario)//Autor
        ->setLastModifiedBy($usuario)//Ultimo usuario que lo modificó
        ->setTitle("Reporte excel")
            ->setSubject("Reporte excel")
            ->setDescription("Reporte excel")
            ->setKeywords("Reporte excel")
            ->setCategory("Reporte excel");

        // Obtenemos los nombres de las columnas y la cantidad de columnas.
        $titulosColumnas = array();
        $columnas = mysql_num_fields($result);
        for ( $i = 0; $i < $columnas; $i++ ) 
        {
            array_push($titulosColumnas,mysql_field_name( $result, $i ));
        }

        $letraFinal = GetLetras($columnas-1);

        $objPHPExcel->setActiveSheetIndex(0)
            ->mergeCells('A1:'.$letraFinal.'1');

        // Se agregan los titulos del reporte
        $objPHPExcel->setActiveSheetIndex(0)
            ->setCellValue('A1', $tituloReporte);

        for ( $i = 0; $i < $columnas; $i++ )
        {
            $objPHPExcel->setActiveSheetIndex(0)
            ->setCellValue(GetLetras($i).'3', $titulosColumnas[$i]);
        }

        $r=4;
        while ($fila = mysql_fetch_array($result)){
            for ( $i = 0; $i < $columnas; $i++ )
            {
                $objPHPExcel->setActiveSheetIndex(0)
                ->setCellValue(GetLetras($i).$r,$fila[$titulosColumnas[$i]]);
            }
            $r++;
        }

        $estiloTituloReporte = array(
            'font' => array(
                'name' => 'Verdana',
                'bold' => true,
                'italic' => false,
                'strike' => false,
                'size' => 16,
                'color' => array(
                    'rgb' => 'FFFFFF'
                )
            ),
            'fill' => array(
                'type' => PHPExcel_Style_Fill::FILL_SOLID,
                'color' => array('argb' => 'FF220835')
            ),
            'borders' => array(
                'allborders' => array(
                    'style' => PHPExcel_Style_Border::BORDER_NONE
                )
            ),
            'alignment' => array(
                'horizontal' => PHPExcel_Style_Alignment::HORIZONTAL_CENTER,
                'vertical' => PHPExcel_Style_Alignment::VERTICAL_CENTER,
                'rotation' => 0,
                'wrap' => TRUE
            )
        );

        $estiloTituloColumnas = array(
            'font' => array(
                'name' => 'Arial',
                'bold' => true,
                'color' => array(
                    'rgb' => 'FFFFFF'
                )
            ),
            'fill' => array(
                'type' => PHPExcel_Style_Fill::FILL_GRADIENT_LINEAR,
                'rotation' => 90,
                'startcolor' => array(
                    'rgb' => '00004d'
                ),
                'endcolor' => array(
                    'argb' => '00004d'
                )
            ),
            'borders' => array(
                'top' => array(
                    'style' => PHPExcel_Style_Border::BORDER_MEDIUM,
                    'color' => array(
                        'rgb' => '000000'
                    )
                )
            ),
            'alignment' => array(
                'horizontal' => PHPExcel_Style_Alignment::HORIZONTAL_CENTER,
                'vertical' => PHPExcel_Style_Alignment::VERTICAL_CENTER,
                'wrap' => TRUE
            ));

        $estiloInformacion = new PHPExcel_Style();
        $estiloInformacion->applyFromArray(
            array(
                'font' => array(
                    'name' => 'Arial',
                    'color' => array(
                        'rgb' => '000000'
                    )
                ),
                'fill' => array(
                    'type' => PHPExcel_Style_Fill::FILL_SOLID,
                    'color' => array('rgb' => 'ffffff')
                ),
                'borders' => array(
                    'left' => array(
                        'style' => PHPExcel_Style_Border::BORDER_THIN,
                        'color' => array(
                            'rgb' => '000000'
                        )
                    )
                )
            ));

        $objPHPExcel->getActiveSheet()->getStyle('A1:'.$letraFinal.'1')->applyFromArray($estiloTituloReporte);
        $objPHPExcel->getActiveSheet()->getStyle('A3:'.$letraFinal.'3')->applyFromArray($estiloTituloColumnas);
        //$objPHPExcel->getActiveSheet()->setSharedStyle($estiloInformacion, "A4:".$letraFinal . ($columnas - 1));

        for ($i = 'A'; $i <= $letraFinal; $i++) {
            $objPHPExcel->setActiveSheetIndex(0)
                ->getColumnDimension($i)->setAutoSize(TRUE);
        }

        // Se asigna el nombre a la hoja
        $objPHPExcel->getActiveSheet()->setTitle('REGISTROS');

        // Se activa la hoja para que sea la que se muestre cuando el archivo se abre
        $objPHPExcel->setActiveSheetIndex(0);
        // Inmovilizar paneles
        //$objPHPExcel->getActiveSheet(0)->freezePane('A4');
        $objPHPExcel->getActiveSheet(0)->freezePaneByColumnAndRow(0, 4);

        // Se manda el archivo al navegador web, con el nombre que se indica (Excel2007)
        header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
        header('Content-Disposition: attachment;filename="'.$nombreArchivo.'.xlsx"');
        header('Cache-Control: max-age=0');

        $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
        $objWriter->save('php://output');
        exit;
    } else {
        print_r('No hay resultados para mostrar');
    }
}


function GetLetras($i)
{
    $letras = array('A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z');
    return $letras[$i];
}
?>