4-8 코드 질문드립니다.

4-2 Flask 시작하기 - 서버만들기 - 질문

뭐가 문제인걸까요..? <img alt="스파르타 즉문즉답" src="https://cdn-media.spartaclub.kr/media/tempfiles/community/b33677c7-d334-4ca2-83cc-931c37153f6a스크린샷 2022-10-21 오전 11.26.38.png"><img alt="스파르타 즉문즉답" src="https://cdn-media.spartaclub.kr/media/tempfiles/community/ce14fe8c-9648-4f3a-ba46-a02115b29542스크린샷 2022-10-21 오전 11.26.19.png"><img alt="스파르타 즉문즉답" src="https://cdn-media.spartaclub.kr/media/tempfiles/community/7be7d9b7-df18-4fe2-ac26-b1bcbdd93c5c스크린샷 2022-10-21 오전 11.27.03.png">