void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await dotenv.load(fileName: "./env");
  var documentsDirectory = await path_provider.getApplicationDocumentsDirectory();
    
  Hive.init(documentsDirectory.path);
  Hive.registerAdapter(UserDataModelAdapter());
  Hive.registerAdapter(TaskHiveModelAdapter());
    
  runApp(const MyApp());
}

我的文件目录：

生成错误：

No file or variants found for asset: .env.
Error detected in pubspec.yaml:
    
Target debug_android_application failed: Exception: Failed to bundle asset files.
    
    
FAILURE: Build failed with an exception.

我在pubspec.yaml中设置了.env如下：

assets:
  - .env

为什么Flutter在启动时找不到.env文件？