Jekyll - Psych::Nodes (NameError)
Jekyll 遇到 uninitialized constant Psych::Nodes (NameError)
當 jekyll 的環境遇到 Ruby 2.1.x Psych 2.0.10 會出現不相容問題，所以請
1 | $ gem uninstall psych |
Jekyll - Psych::Nodes (NameError)
https://andyyou.github.io/2015/04/04/fix-jekyll-psych-issue/