SSL설치가 이렇게 어렵나요?

Let's Encrypt로 Ubuntu 18.04 Nginx에 라이트세일에 깔려고 합니다.

라엘님 블로그 보고 그대로 따라했어요

근데 에러가 자꾸 뜨네요 에러 내용이에요

Using the webroot path /home/myuser1/www for all unmatched domains.
Waiting for verification...
Cleaning up challenges
Failed authorization procedure. example.co.kr (http-01): urn:ietf:params:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://example.co.kr/.well-known/acme-challenge/soE1JgTho4gT72dH9Cw0pL2nzSzIXw1f7DXEwz8wcSs [1.1.1.1]: "<html>\r\n<head><title>404 Not Found</title></head>\r\n<body>\r\n<center><h1>404 Not Found</h1></center>\r\n<hr><center>nginx/1.17.6</ce", www.example.co.kr (http-01): urn:ietf:params:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://www.example.co.kr/.well-known/acme-challenge/kKq7myNCzoTwR7e655u68aLJ26v1SPk7Zm-xbtcCJ4c [1.1.1.1]: "<html>\r\n<head><title>404 Not Found</title></head>\r\n<body>\r\n<center><h1>404 Not Found</h1></center>\r\n<hr><center>nginx/1.17.6</ce"
IMPORTANT NOTES:
- The following errors were reported by the server:

Domain: example.co.kr
Type: unauthorized
Detail: Invalid response from
http://example.co.kr/.well-known/acme-challenge/soE1JgTho4gT72dH9Cw0pL2nzSzIXw1f7DXEwz8wcSs
[1.1.1.1]: "<html>\r\n<head><title>404 Not
Found</title></head>\r\n<body>\r\n<center><h1>404 Not
Found</h1></center>\r\n<hr><center>nginx/1.17.6</ce"

Domain: www.example.co.kr
Type: unauthorized
Detail: Invalid response from
http://www.example.co.kr/.well-known/acme-challenge/kKq7myNCzoTwR7e655u68aLJ26v1SPk7Zm-xbtcCJ4c
[1.1.1.1]: "<html>\r\n<head><title>404 Not
Found</title></head>\r\n<body>\r\n<center><h1>404 Not
Found</h1></center>\r\n<hr><center>nginx/1.17.6</ce"

To fix these errors, please make sure that your domain name was
entered correctly and the DNS A/AAAA record(s) for that domain
contain(s) the right IP address.

클라우드 플레어로 DNS만 이용하고 있습니다. 어떻게 할 수 있을까요?

사이트 주소랑 IP주소는 임의로 변경했습니다.

SSL설치가 이렇게 어렵나요?

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