Nacos Discovery项目中LoadBalancerClient提示找不到Bean，如何解决？

Question

Controller：

package com.example.nacosdiscoverycloudprovider.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class NacosController {

    @Autowired
    private LoadBalancerClient loadBalancerClient;

    @Autowired
    private RestTemplate restTemplate;

    @Value("${spring.application.name}")
    private String appName;

    @GetMapping("/echo/app-name")
    public String echoAppName() {
        ServiceInstance serviceInstance = loadBalancerClient.choose("nacos-producer");
        String url = String.format("http://%s:%s/echo/%s",serviceInstance.getHost(),serviceInstance.getPort(),appName);
        System.out.println("request url:"+url);
        return restTemplate.getForObject(url,String.class);
    }
}

报错：

***************************
APPLICATION FAILED TO START
***************************

Description:

Field loadBalancerClient in com.example.nacosdiscoverycloudprovider.controller.NacosController required a bean of type 'org.springframework.cloud.client.loadbalancer.LoadBalancerClient' that could not be found.

The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Autowired(required=true)


Action:

Consider defining a bean of type 'org.springframework.cloud.client.loadbalancer.LoadBalancerClient' in your configuration.

可以问题是我是完全官方文档写的，为啥会报错呢？
官方文档：https://github.com/alibaba/spring-cloud-alibaba/wiki/Nacos-discovery

按我理解，是IOC容器里找不到LoadBalancerClient的实现类，我按ctrl+alt+B，也显示没有这个类的实现类。那应该如何解决，手动实现这个接口吗？