I had the same problem and I found a workaround here at https://github.com/jekyll/jekyll/issues/8523
Add gem "webrick" to the Gemfile in your website. Than run bundle install
At this point you can run bundle exec jekyll serve
For me it works!
I had the same problem and I found a workaround here at https://github.com/jekyll/jekyll/issues/8523
Add gem "webrick" to the Gemfile in your website. Than run bundle install
At this point you can run bundle exec jekyll serve
For me it works!