How to fix Ruby Gem installer issues on Windows

How to fix Ruby Gem installer issues on Windows


After use Ruby Installer to use gem on Windows. I got this error when try the command “gem install”:

C:\Users\Hoang>gem install sass
ERROR:  While executing gem ... (Encoding::ConverterNotFoundError)
    code converter not found (UTF-16LE to Windows-1258)

=> Just run “chcp 850” before run “gem install”.

Build tools required

For example, I run “gem install jekyll” to install jekyll, but I got this error.

ERROR:  Error installing jekyll:
        The 'posix-spawn' native gem requires installed build tools.

Please update your PATH to include build tools or download the DevKit
from '' and follow the instructions
at ''

=> Download development kit at

  • I use Ruby 2.1.x and Windows 8.1 x64 so I choose the exe file in this section: “For use with Ruby 2.0 and above (x64 - 64bits only)”.
  • Make a new folder named “Ruby DevKit”, copy the downloaded exe file to this folder, then run it for extracting (7z).
  • When the file is extracted, In the Ruby DevKit folder, hold Shift then click the right mouse button, select Open command window here.
  • On the command windows, run “chcp 850”, then run “ruby dk.rb init”, then “ruby dk.rb install” to bind it to ruby installations in your path.
  • Try the install command “gem install jekyll” again