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

If you are using windows

1. Go to this folder C:\Ruby24-x64\lib\ruby\gems\2.4.0\gems\eventmachine-1.2.5-x64-mingw32\lib

2. open this file eventmachine.rb

3. write this require 'em/pure_ruby' in the first line of code in the file

this will make it work with no issues.

For Ruby 2.4 & eventmachine 1.2.6 on Windows 10.

You gotta uninstall first eventmachine and then install it again with platform ruby:

gem uninstall eventmachine  (select all versions if prompted)gem install eventmachine --platform ruby

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.