appconfig오류문제

package hello.core.order;

import hello.core.discount.DiscountPolicy;
import hello.core.discount.FixDiscountPolicy;
import hello.core.discount.RateDiscountPolicy;
import hello.core.member.Member;
import hello.core.member.MemberRepository;
import hello.core.member.MemoryMembereRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class OrderServiceImpl implements OrderService {

    private MemberRepository memberRepository ;
    // private final DiscountPolicy discountPolicy = new FixDiscountPolicy();
    // private final DiscountPolicy discountPolicy = new RateDiscountPolicy();
    private DiscountPolicy discountPolicy ;

    @Autowired
    public void setMemberRepository(MemberRepository memberRepository){
        this.memberRepository= memberRepository;
    }

    @Autowired
    public void setDiscountPolicy(DiscountPolicy discountPolicy) {
        this.discountPolicy = discountPolicy;
    }

    @Override
    public Order creatOrder(Long memberId, String itemName, int itemPrice){
        Member member = memberRepository.findById(memberId);
        int discountPrice = discountPolicy.discount(member, itemPrice);

        return new Order(memberId, itemName, itemPrice, discountPrice);
    }

    //테스트 용도
    public MemberRepository getMemberRepository() {
        return memberRepository;
    }
}

@Configuration
public class AppConfig {

    @Bean
    public MemberService memberService() {
        System.out.println("call AppConfig.memberService");
        return  new MemberServiceImpl(memberRepository());
    }
    @Bean
    public  MemberRepository memberRepository() {
        System.out.println("call AppConfig.memberRepository");
        return new MemoryMembereRepository();
    }

    @Bean
    public OrderService orderService() {
        System.out.println("call AppConfig.orderService");
        return  new OrderServiceImpl(memberRepository(), discountPolicy());
    }

    @Bean
    public DiscountPolicy discountPolicy() {
        // return new FixDiscountPolicy();
        return new RateDiscountPolicy();
    }
}

수업을 따라가다가 appconfig에서 오류가 났습니다 어떻게 해결하면 좋을까요?