쿼리오류 Field "thumbnail" must not have a selection...

메인 페이지에서 Props로 받아 포스트 데이터 출력하기 강의에서

여기까지 한 후, 2개의 포스트 아이템이 화면에 잘 출력되는지 확인해주세요.
>>>> 이 부분까지 하고 실행을 하려니 아래와 같은 쿼리 오류가 생겼습니다.

There was an error in your GraphQL query:

      Field "thumbnail" must not have a selection since type "String" has no subfields.

      This can happen if you e.g. accidentally added { } to the field "thumbnail". If you didn't expect "thumbnail" to be of type "String" make sure that your input source and/or plugin is correct.
      However, if you expect "thumbnail" to exist, the field might be accessible in another subfield. Please try your query in GraphiQL.

      It is recommended to explicitly type your GraphQL schema if you want to use optional fields.

publicURL 을 못가져오는것 같은데.. 어떻게 해결해야할까요 ㅠ.ㅠ

레포지토리 남깁니다!

https://github.com/syankkim/syankkim.github.io

Field "thumbnail" must not have a selection since type "String" has no subfields.

    file(name: { eq: "profile-image" }) {
      childImageSharp {
        gatsbyImageData(width: 120, height: 120)
      }
    }