Jekyll error: cannot find gem jekyll (> = 0.a) (Gem :: GemNotFoundException

Question

When executing sudo jekyll serve , the following error appears:

 Users/myusername/.rvm/rubies/ruby-2.4.2/lib/ruby/site_ruby/2.4.0/rubygems.rb:271:in 'find_spec_for_exe': can't find gem jekyll (>= 0.a) (Gem::GemNotFoundException) from /Users/myusername/.rvm/rubies/ruby-2.4.2/lib/ruby/site_ruby/2.4.0/rubygems.rb:299:in 'activate_bin_path' from /Users/myusername/.rvm/gems/ruby-2.4.2/bin/jekyll:23:in '<main>' from /Users/myusername/.rvm/gems/ruby-2.4.2/bin/ruby_executable_hooks:15:in 'eval' from /Users/myusername/.rvm/gems/ruby-2.4.2/bin/ruby_executable_hooks:15:in '<main>' 

In case this helps:

• jekyll -v returns jekyll 3.6.2
• ruby -v returns ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin15]
• gem -v returns 2.6.14
• bundle -v returns Bundler version 1.16.0

In my Gem file, I have:

ruby '2.4.2'

rmv list output:

 ruby-2.3.5 [ x86_64 ] =* ruby-2.4.2 [ x86_64 ] # => - current # =* - current && default # * - default 

Answer 1

I finally solved this by doing:

 sudo rm -rf _site bundle update bundle exec jekyll serve 

And then always use bundle exec jekyll serve instead of sudo jekyll serve or jekyll serve .

I got this solution thanks to the answers in this post .