Unable to load the EventMachine C extension; To use the pure-ruby reactor

I was encountering this error message on Windows 10 while trying to use Jekyll’s LiveReload feature. The other answers here did not solve the problem completely, or risked having the issue re-occur the next time bundle install is run.

My solution (taken from this site) was to:

1. Run this console command

   gem uninstall eventmachine 
   

   and choose to uninstall eventmachine-1.2.7-x64-mingw32 gems from your system.

2. Edit Gemfile inside your project directory and add this line inside:

   gem 'eventmachine', '1.2.7', git: 'https://github.com/eventmachine/eventmachine.git', tag: 'v1.2.7'
   

3. Run

   bundle install
   

4. Clean up your jekyll build and cache with command

   bundle exec jekyll clean
   

You can now use the --livereload parameter without getting any issue, even if you execute bundle install in future.