인프런 커뮤니티 질문&답변

package hello.core;
import hello.core.Order.OrderService;
import hello.core.Order.OrderServiceImpl;
import hello.core.discount.DiscountPolicy;

import hello.core.discount.RateDiscountPolicy;
import hello.core.member.MemberRepository;
import hello.core.member.MemberService;
import hello.core.member.MemberServiceImpl;
import hello.core.member.MemoryMemberRepository;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


@Configuration
public class AppConfig {
   @Bean
    public MemberService memberService() {
        return new MemberServiceImpl(memberRepository());
    }
    @Bean
    public OrderService orderService() {
        return new OrderServiceImpl(
                 memberRepository(),
                discountPolicy());
    }
    @Bean
    public MemberRepository memberRepository() {
        return new MemoryMemberRepository();
    }
    @Bean
    public DiscountPolicy discountPolicy() {
// return new FixDiscountPolicy();
        return new RateDiscountPolicy();
    }
}
강의내용그대로 입력하였는데 오더서비스부분에 빨간줄이나오네요 왜그런걸까요?