error_log current directory: /Users/idowon/.rbenv/versions/2.6.6/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.10/ext/mimemagic /Users/idowon/.rbenv/versions/2.6.6/bin/ruby -rrubygems /Users/idowon/.rbenv/versions/2.6.6/lib/ruby/gems/2.6.0/gems/rake-12.3.3/exe/rake RUBYARCHDIR\=/Users/idowon/.rbenv/versions/2.6.6/lib/ruby/gems/2.6.0/extensions/x86_64-darwin-18/2.6.0/mimemagic-0.3.10 RUBYLIBDIR\=/Users/..