python3statement.github.io feature/cherrypy $ jekyll serve -wTraceback (most recent call last):        10: from /usr/local/bin/jekyll:23:in `<main>'         9: from /usr/local/bin/jekyll:23:in `load'         8: from /usr/local/lib/ruby/gems/2.5.0/gems/jekyll-3.8.3/exe/jekyll:11:in `<top (required)>'         7: from /usr/local/lib/ruby/gems/2.5.0/gems/jekyll-3.8.3/lib/jekyll/plugin_manager.rb:50:in `require_from_bundler'         6: from /usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/bundler.rb:107:in `setup'         5: from /usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/bundler/runtime.rb:26:in `setup'         4: from /usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/bundler/runtime.rb:26:in `map'         3: from /usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/forwardable.rb:229:in `each'         2: from /usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/forwardable.rb:229:in `each'         1: from /usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/bundler/runtime.rb:31:in `block in setup'/usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/bundler/runtime.rb:313:in `check_for_activated_spec!': You have already activated rouge 3.2.1, but your Gemfile requires rouge 2.2.1. Prepending `bundle exec` to your command may solve this. (Gem::LoadError)