I've tried several times to use the plugin you've developed, But everytime I download this'Libfredo6' extension and open sketchup pro, there's a 'Load Error' window saying

'Error Loading File Fredo6_!LibFredo6.rb
Error: #<ArgumentError: invalid byte sequence in UTF-8>
c:/users/오하경/appdata/roaming/sketchup/sketchup 2019/sketchup/plugins/fredo6_!libfredo6/top_libfredo6.rbe:52:in gsub' c:/users/오하경/appdata/roaming/sketchup/sketchup 2019/sketchup/plugins/fredo6_!libfredo6/top_libfredo6.rbe:52:in get_dir_from_ENV'
c:/users/오하경/appdata/roaming/sketchup/sketchup 2019/sketchup/plugins/fredo6_!libfredo6/top_libfredo6.rbe:415:in `dir_appdata'
c:/users/오하경/appdata/roaming/sketchup/sketchup 2019/sketchup/plugins/fredo6_!
... and the plugins didn't work

How can I fix it?