Jekyll serve: /usr/lib/ruby/gems/2.5.0/gems/bundler-1.16.2/lib/bundler/spec_set.rb:91:in `block in materialize': Could not find i18n-0.9.5 in any of the sources (Bundler::GemNotFound)

$ git clone https://github.com/fulldecent/EIPs.git fdeips
$ cd fdeips
james at james-pc in ~/fdeips (patch-11●)
$ jekyll serve # this is just after installing Jekyll on Manjaro from AUR
Traceback (most recent call last):
	12: from /usr/bin/jekyll:23:in `<main>'
	11: from /usr/bin/jekyll:23:in `load'
	10: from /usr/lib/ruby/gems/2.5.0/gems/jekyll-3.8.0/exe/jekyll:11:in `<top (required)>'
	 9: from /usr/lib/ruby/gems/2.5.0/gems/jekyll-3.8.0/lib/jekyll/plugin_manager.rb:50:in `require_from_bundler'
	 8: from /usr/lib/ruby/gems/2.5.0/gems/bundler-1.16.2/lib/bundler.rb:107:in `setup'
	 7: from /usr/lib/ruby/gems/2.5.0/gems/bundler-1.16.2/lib/bundler/runtime.rb:20:in `setup'
	 6: from /usr/lib/ruby/gems/2.5.0/gems/bundler-1.16.2/lib/bundler/runtime.rb:108:in `block in definition_method'
	 5: from /usr/lib/ruby/gems/2.5.0/gems/bundler-1.16.2/lib/bundler/definition.rb:227:in `requested_specs'
	 4: from /usr/lib/ruby/gems/2.5.0/gems/bundler-1.16.2/lib/bundler/definition.rb:238:in `specs_for'
	 3: from /usr/lib/ruby/gems/2.5.0/gems/bundler-1.16.2/lib/bundler/definition.rb:171:in `specs'
	 2: from /usr/lib/ruby/gems/2.5.0/gems/bundler-1.16.2/lib/bundler/spec_set.rb:85:in `materialize'
	 1: from /usr/lib/ruby/gems/2.5.0/gems/bundler-1.16.2/lib/bundler/spec_set.rb:85:in `map!'
/usr/lib/ruby/gems/2.5.0/gems/bundler-1.16.2/lib/bundler/spec_set.rb:91:in `block in materialize': Could not find i18n-0.9.5 in any of the sources (Bundler::GemNotFound)

Another developer has gotten this command to work in the same repository and branch.

Found this.

Fixed, as per the above link, I used

bundle install --path vendor/bundle

and also:

bundle exec jekyll serve