bundle exec jekyll serve

[!] There was an error parsing `Gemfile`: 
[!] There was an error while loading `jekyll-theme-chirpy.gemspec`: invalid byte sequence in US-ASCII. Bundler cannot continue.

 #  from /Users/joonhyuk/workspace/Han-Joon-Hyeok.github.io/jekyll-theme-chirpy.gemspec:13
 #  -------------------------------------------
 #  
 >    spec.files         = `git ls-files -z`.split("\x0").select { |f|
 #      f.match(%r!^((assets\/(css|img|js\/[a-z])|_(includes|layouts|sass|config|data|tabs|plugins))|README|LICENSE|index|feed|app|sw|404|robots)!i)
 #  -------------------------------------------
. Bundler cannot continue.

 #  from /Users/joonhyuk/workspace/Han-Joon-Hyeok.github.io/Gemfile:5
 #  -------------------------------------------
 #  
 >  gemspec
 #  
 #  -------------------------------------------

export LC_CTYPE=en_US.UTF-8