我尝试使用图像路径上传图像，在我的应用程序正常之前。当我尝试添加import 'package：path / path.dart';和basename（image.path），为了上传我的图像，我在对话框警报中得到了一个新的错误。更多详细信息：这是我的代码：

import 'package:path/path.dart';

    Future uploadFile() async {
        final FirebaseUser user = await FirebaseAuth.instance.currentUser();
        final userId = user.uid;
        _imageList.forEach((_image) {
          final StorageReference firebaseStorageRef = FirebaseStorage.instance
              .ref()
              .child('category')
              .child('food')
              .child('images')
              .child(username)
              .child(basename(_image.path));
          final StorageUploadTask task = firebaseStorageRef.putFile(_image);
          return task;
        });
      }

下面的代码，我得到了一个错误：

Future<void> alertSuccess() async {
    return showDialog<void>(

    /*this error*/
    context: context,
    /*------------*/

      barrierDismissible: false, // user must tap button!
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text('Success'),
          content: SingleChildScrollView(
            child: ListBody(
              children: <Widget>[
                Text(
                    'You success save data.'),
              ],
            ),
          ),
          actions: <Widget>[
            FlatButton(
              child: Text('OK'),
              onPressed: () {
                Navigator.pop(context);
                Navigator.pushReplacement(
                    context,
                    new MaterialPageRoute(
                        builder: (context) => PublicService()));
              },
            ),
          ],
        );
      },
    );
  }