bundler: failed to load command:

jekyll主题更改，执行bundle exec jekyll serve报错

met@bogon jekyll-theme-persephone % bundle exec jekyll serve
bundler: failed to load command: jekyll (/usr/local/bin/jekyll)
Gem::Exception: can't find executable jekyll for gem jekyll. jekyll is not currently included in the bundle, perhaps you meant to add it to your Gemfile?
  /Library/Ruby/Gems/2.6.0/gems/bundler-2.1.4/lib/bundler/rubygems_integration.rb:374:in `block in replace_bin_path'
  /Library/Ruby/Gems/2.6.0/gems/bundler-2.1.4/lib/bundler/rubygems_integration.rb:402:in `block in replace_bin_path'
  /usr/local/bin/jekyll:23:in `<top (required)>'

解决方法：

在该jekyll主题下的gemfile文件中，加入你安装的jekyll ，最好带上版本号。
gem "jekyll", "~> 4.1.1"

查看jekyll的版本号

jekyll -v

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