If you are using Certbot and encounter an error like the following
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe3 in position 12: ordinal not in range(128)This may occur because the nginx configuration file (conf file) contains non-ASCII characters (e.g., Japanese).
To solve this problem, remove the Japanese characters in the nginx conf file or convert them to English. This will allow Certbot to work properly.