Invalid data displaying image from path - flutter

Question

I am downloading an image from Internet to the device and then updating a SQLITE table to store the image path:
Future<void> _download(String archivo, String docId, OfertaDB doc) async {
final docUrl = Constantes.docsProyecto+archivo;
final response = await http.get(Uri.parse(docUrl));
// Get the image name
final imageName = path.basename(docUrl);
// Get the document directory path
final appDir = await getApplicationDocumentsDirectory();
// This is the saved image path
// You can use it to display the saved image later
final localPath = path.join(appDir.path, imageName);
// Downloading
final imageFile = File(localPath);
await imageFile.writeAsBytes(response.bodyBytes);
print("path de ofertas ${appDir.path}/${imageName}");
var documentoDescargado = OfertaDB(
id: doc.id,
header: doc.header,
estado: doc.estado,
titulo: doc.titulo,
titulofr: doc.titulofr,
texto: doc.texto,
textofr: doc.textofr,
fechas: doc.fechas,
imagen: doc.imagen,
path: "${appDir.path}/${imageName}"
);
await dbHelper.updateOferta(documentoDescargado);
}
Then on another screen I need to display the image from SQLITE table:
var pathAr = news_promos.path;
print("path es ${pathAr}");//output /data/user/0/red.faro.labelconciergeflutter/app_flutter/Ezg7a9joalimaldivesvilla.jpeg
File image = File(pathAr);
Then to display the image:
Container(
alignment: Alignment.center,
width: 100,
height: 100,
child: image != null
? Image.file(image!, fit: BoxFit.cover)
: const Text('Please select an image'),
),
But the image is not displayed, it is shown an Exception: invalid image data error
What is wrong in the code used?