返回类型不是闭包上下文所需的小部件

我尝试完成教程，但收到此错误（看图片）。

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:provider_architecture/core/viewmodels/login_model.dart';
import 'package:provider_architecture/locator.dart';

class LoginView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider<LoginModel>(
      builder: (context) => locator<LoginModel>(), // the error is here
      child: Consumer<LoginModel>(
        builder: (context, model, child) => Scaffold(),
      ),
    );
  }
}

Change:

builder: (context) => locator<LoginModel>()

to:

create: (context) => locator<LoginModel>()