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We can set up a local version of our Jekyll GitHub Pages website to preview our website before making the changes public. But after upgrading MacOS to version “High Sierra” on my MacBook, when I run the jekyll bundle exec jekyll serve command it throws the following error message:

$ bundle exec jekyll serve
bundler: command not found: jekyll
Install missing gem executables with `bundle install`

What causes this error

This error message is self explanatory. It means that we are trying to use the Jekyll gem while it is not installed in our system. It also tells us what exactly we need to do to solve this problem.

How to solve it

To solve this problem we will do as said in the error message:

bundle install

Fetching gem metadata from https://rubygems.org/.........
Using i18n 0.8.4
Using minitest 5.10.2
Using thread_safe 0.3.6
Using tzinfo 1.2.3
Using activesupport 4.2.8
Using addressable 2.4.0
Using bundler 1.16.0.pre.3
Using coffee-script-source 1.12.2
Using execjs 2.7.0
Using coffee-script 2.4.1
Using colorator 0.1
Fetching ffi 1.9.18


Your user account isn't allowed to install to the system RubyGems.
  You can cancel this installation and run:

      bundle install --path vendor/bundle

  to install the gems into ./vendor/bundle/, or you can enter your password
  and install the bundled gems to RubyGems using sudo.

  Password:

Enter your password after prompted and then watch the magic happen…

  Password:

Installing ffi 1.9.18 with native extensions
Fetching ethon 0.10.1
Installing ethon 0.10.1
Using multipart-post 2.0.0
...
Fetching jekyll-github-metadata 1.11.1
Installing jekyll-github-metadata 1.11.1
Using mini_portile2 2.0.0
Fetching nokogiri 1.6.7.2
Installing nokogiri 1.6.7.2 with native extensions


Your user account isn't allowed to install to the system RubyGems.
  You can cancel this installation and run:

      bundle install --path vendor/bundle

  to install the gems into ./vendor/bundle/, or you can enter your password
  and install the bundled gems to RubyGems using sudo.

  Password:

Fetching html-pipeline 2.4.0
Installing html-pipeline 2.4.0
Fetching jekyll-mentions 1.1.2
...
Fetching terminal-table 1.8.0
Installing terminal-table 1.8.0
Fetching github-pages 78
Installing github-pages 78
Bundle complete! 1 Gemfile dependency, 50 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
Post-install message from html-pipeline:
-------------------------------------------------
Thank you for installing html-pipeline!
You must bundle Filter gem dependencies.
See html-pipeline README.md for more details.
https://github.com/jch/html-pipeline#dependencies
-------------------------------------------------
Post-install message from github-pages:
---------------------------------------------------
Thank you for installing github-pages!
GitHub Pages recently upgraded to Jekyll 3.0, which
includes some breaking changes. More information:
https://github.com/blog/2100-github-pages-jekyll-3
---------------------------------------------------

Note! If you received an error message when using the bundle install command, then read this article.

Looks good. Let’s now try to run the bundle exec jekyll serve command again:

bundle exec jekyll serve

Configuration file: /Users/user/GitHub/website/_config.yml
            Source: /Users/user/GitHub/website
       Destination: /Users/user/GitHub/website/_site
 Incremental build: disabled. Enable with --incremental
      Generating...
                    done in 20.539 seconds.
 Auto-regeneration: enabled for '/Users/user/GitHub/website'
Configuration file: /Users/user/GitHub/website/_config.yml
    Server address: http://127.0.0.1:4000/
  Server running... press ctrl-c to stop.

And it works.

Conclusion

That’s it, we’re done. So simple isn’t it?

If you are having trouble fixing this problem with the instructions above, but are being able to solve this problem with any another method please describe it in the comment section below. Thanks!

If this article has helped you solve the problem then please leave a comment :smiley:

Thanks for reading!