인프런 커뮤니티 질문&답변

package hello.core.member;

import java.util.HashMap;
import java.util.Map;


public class MemoryMembereRepository implements MemberRepository{

    private static Map<Long, Member> store = new HashMap<>();

    @Override
    public void save(Member member) {
        store.put(member.getId(), member);

    }

    @Override
    public Member findById(Long memberId) {
        return store.get(memberId);
    }

}

강의를 보며 위 코드를 작성하였는데

Class 'MemoryMembereRepository' must either be declared abstract or implement abstract method 'findBy(Long)' in 'MemberRepository'

Method does not override method from its superclass

두개 오류가 뜹니다 어떻게 해야할까요?