I get this error executing bundle exec jekyll build.
/var/lib/gems/2.3.0/gems/sass-3.5.5/lib/sass/engine.rb:2:in `require': undefined class/module Digest::Base (ArgumentError)
from /var/lib/gems/2.3.0/gems/sass-3.5.5/lib/sass/engine.rb:2:in `<top (required)>'
from /var/lib/gems/2.3.0/gems/sass-3.5.5/lib/sass.rb:99:in `require'
from /var/lib/gems/2.3.0/gems/sass-3.5.5/lib/sass.rb:99:in `<top (required)>'
from /var/lib/gems/2.3.0/gems/jekyll-sass-converter-1.5.1/lib/jekyll/converters/scss.rb:3:in `require'
from /var/lib/gems/2.3.0/gems/jekyll-sass-converter-1.5.1/lib/jekyll/converters/scss.rb:3:in `<top (required)>'
from /var/lib/gems/2.3.0/gems/jekyll-sass-converter-1.5.1/lib/jekyll-sass-converter.rb:4:in `require'
from /var/lib/gems/2.3.0/gems/jekyll-sass-converter-1.5.1/lib/jekyll-sass-converter.rb:4:in `<top (required)>'
from /var/lib/gems/2.3.0/gems/jekyll-3.7.0/lib/jekyll.rb:198:in `require'
from /var/lib/gems/2.3.0/gems/jekyll-3.7.0/lib/jekyll.rb:198:in `<top (required)>'
from /var/lib/gems/2.3.0/gems/jekyll-3.7.0/exe/jekyll:8:in `require'
from /var/lib/gems/2.3.0/gems/jekyll-3.7.0/exe/jekyll:8:in `<top (required)>'
from /usr/local/bin/jekyll:23:in `load'
from /usr/local/bin/jekyll:23:in `<main>'
I get this error executing
bundle exec jekyll build
.