undefined method `epoll?' for EventMachine

[Ams627]

Any ideas what is happening here?

R:>bundle exec guard -d
23:21:58 - INFO - Run 'gem install win32console' to use color on Windows
23:21:58 - DEBUG - Notiffany: gntp not available (Please add "gem 'ruby_gntp'" t
o your Gemfile and run your app with "bundle exec".).
23:21:58 - DEBUG - Notiffany: growl not available (Unsupported platform "mingw32
").
23:21:58 - DEBUG - Notiffany: terminal_notifier not available (Unsupported platf
orm "mingw32").
23:21:58 - DEBUG - Notiffany: libnotify not available (Unsupported platform "min
gw32").
23:21:58 - DEBUG - Notiffany: notifysend not available (Unsupported platform "mi
ngw32").
23:21:58 - DEBUG - Notiffany: notifu not available (Please add "gem 'rb-notifu'"
to your Gemfile and run your app with "bundle exec".).
23:21:58 - DEBUG - Command execution: {"ALTERNATE_EDITOR"=>"false"} emacsclient
--eval '1'
23:21:58 - DEBUG - Notiffany: emacs not available (Emacs client failed).
23:21:58 - DEBUG - Notiffany: tmux not available (:tmux notifier is only availab
le inside a TMux session.).
23:21:58 - DEBUG - Notiffany: file not available (No :path option given).
23:21:58 - DEBUG - Notiffany is using TerminalTitle to send notifications.
23:21:58 - DEBUG - Command execution: hash stty
23:21:58 - DEBUG - Guard starts all plugins
23:21:58 - DEBUG - Hook :start_begin executed for Guard::Bundler

23:22:00 - INFO - Bundle already up-to-date
23:22:00 - DEBUG - Hook :start_end executed for Guard::Bundler
23:22:00 - DEBUG - Hook :start_begin executed for Guard::Shell
23:22:00 - DEBUG - Hook :start_end executed for Guard::Shell
23:22:00 - DEBUG - Hook :start_begin executed for Guard::LiveReload
23:22:00 - DEBUG - Hook :start_end executed for Guard::LiveReload
C:/tools/ruby24/lib/ruby/gems/2.4.0/gems/guard-livereload-2.5.2/lib/guard/livere
load/reactor.rb:48:in _start_reactor': undefined method epoll?' for EventMachi
ne:Module
Did you mean? epoll (NoMethodError)
from C:/tools/ruby24/lib/ruby/gems/2.4.0/gems/guard-livereload-2.5.2/lib
/guard/livereload/reactor.rb:11:in `block in initialize'