执行sudo jekyll serve时出现以下错误：
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>'
如果有帮助：
jekyll -v返回jekyll 3.6.2 ruby -v返回ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin15] gem -v返回2.6.14 bundle -v返回Bundler version 1.16.0 在我的Gem文件中，我有：
ruby'2.4.2'
rmv list输出：
ruby-2.3.5 [ x86_64 ]
=* ruby-2.4.2 [ x86_64 ]
# => - current
# =* - current && default
# * - default
答案 0 :(得分：2)
我终于解决了这个问题：
sudo rm -rf _site
bundle update
bundle exec jekyll serve
然后始终使用bundle exec jekyll serve代替sudo jekyll serve或jekyll serve。
由于答案为in this post，我得到了这个解决方案。