Error loading config file spells-테스트.yml

AN EXCEPTION HAS OCCURED:

unacceptable character '?' (0xFFFD) special characters are not allowed

in "<string>", position 22 (org.bukkit.configuration.InvalidConfigurationException)

special characters are not allowed (org.yaml.snakeyaml.reader.ReaderException)

This error has been saved in the errors folder

그 외 다른 스펠들은 전부 오류없이 잘 되는데 predefined-items만 오류가 나네요

이런  오류는 어떻게 해결하나요?