jekyll 可能添加了一些新東西到Gemfile，接著執行bundle install，安裝好後想執行bundle exec jekyll serve卻發生錯誤：
require': cannot load such file -- nokogiri/nokogiri (LoadError)
參考許多網路解法後，有效的是這一篇：
gem uninstall -aIx指令卸載全部的gemsgem install bundler安裝新的bundlerbundle install安裝全部的gems問題解決！
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