PHPExcel error

[xfxstudios]

Prueba asi:

Código PHP:

// Agregar Informacion
$objPHPExcel->setActiveSheetIndex(0);
$objPHPExcel->getActiveSheet()->SetCellValue('A1', "Id");
$objPHPExcel->getActiveSheet()->SetCellValue('B1', "Model");
$objPHPExcel->getActiveSheet()->SetCellValue('C1', "Serial Number");
$objPHPExcel->getActiveSheet()->SetCellValue('D1', "Descripció");
$objPHPExcel->getActiveSheet()->SetCellValue('E1', "Nom Dispositiu");
$objPHPExcel->getActiveSheet()->SetCellValue('F1', "Ip");
$objPHPExcel->getActiveSheet()->SetCellValue('G1', "Ubicació");
$objPHPExcel->getActiveSheet()->SetCellValue('H1', "Planta");
 
$rowcount=2;
while($fila = mysqli_fetch_array($resultado)){
$objPHPExcel->getActiveSheet()->SetCellValue('A'.$rowcount, $fila['id']);
$objPHPExcel->getActiveSheet()->SetCellValue('B'.$rowcount, $fila['model']);
$objPHPExcel->getActiveSheet()->SetCellValue('C'.$rowcount, $fila['serialNumber']);
$objPHPExcel->getActiveSheet()->SetCellValue('D'.$rowcount, $fila['descripcio']);
$objPHPExcel->getActiveSheet()->SetCellValue('E'.$rowcount, $fila['nomDispositiu']);
$objPHPExcel->getActiveSheet()->SetCellValue('F'.$rowcount, $fila['ip']);
$objPHPExcel->getActiveSheet()->SetCellValue('G'.$rowcount, $fila['ubicacio']);
$objPHPExcel->getActiveSheet()->SetCellValue('H'.$rowcount, $fila['plantaId']);
$rowcount++;
}