Error with UTF-8

[dongbum]

I have seen these error messages when using the redmine2github converter.
(My guess is because of file include Korean characters.)

[root@localhost redmine2github-master]# ruby redmine2github.rb USERNAME PROJECTNAME issues.csv -u users.yml -e blahblahblah,http://my.redmine-site.com -m -v
Github username: iamgituser
Github password: **********
Authenticating...
/usr/share/ruby/csv.rb:1987:in `=~': invalid byte sequence in UTF-8 (ArgumentError)
        from /usr/share/ruby/csv.rb:1987:in `init_separators'
        from /usr/share/ruby/csv.rb:1509:in `initialize'
        from /usr/share/ruby/csv.rb:1261:in `new'
        from /usr/share/ruby/csv.rb:1261:in `open'
        from /usr/share/ruby/csv.rb:1119:in `foreach'
        from redmine2github.rb:95:in `<main>'
[root@localhost redmine2github-master]#

[dongbum]

After issue.csv file was save as UTF-8 (Not include BOM), it works.
I wish code update for non-English country user.