Flutter – Problem picking and previewing an image on iOS and Android

I am using the Flutter image_picker library to implement a feature where users can pick an image and upload them to a backend server. Once they click on choosing an image, a dialog box should ask them if they want to load an image from the gallery or take one.

However, based on my implementation, I am receiving a weird exception of

TypeError (type 'Future<XFile?>' is not a subtype of type 'XFile?' of 'result')

I have checked my functions but i don’t see where the problem is. Could you help in directing? Below are the codes.

Thank you very much!

  List<File?> images = List.generate(3, (index) => null);

  Future<void> _getImage(int index) async {
    XFile? image = await showDialog<XFile?>(
      context: context,
      builder: (context) => const ImageSourceDialog(),
    );

    if (image != null) {
      setState(() {
        images[index] = File(image.path);
      });
    }
  }

class ImageSourceDialog extends StatelessWidget {
  const ImageSourceDialog({super.key});

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: const Text("Choissisez une source"),
      content: Row(
        children: [
          Expanded(
            child: ListTile(
              dense: true,
              leading: const Icon(Icons.camera),
              title: const Text("Prendre une photo"),
              onTap: () {
                Navigator.of(context).pop(
                  ImagePicker().pickImage(source: ImageSource.camera),
                );
              },
            ),
          ),
          Expanded(
            child: ListTile(
              dense: true,
              leading: const Icon(Icons.photo),
              title: const Text("Choisir une photo"),
              onTap: () {
                Navigator.of(context).pop(
                  ImagePicker().pickImage(source: ImageSource.gallery),
                );
              },
            ),
          )
        ],
      ),
    );
  }
}

// this is the widget in the stateful class that triggers the upload function

iconButton(onPress: () {_getImage(index)}, ...);