Unable to load the EventMachine C extension; To use the pure-ruby reactor, require 'em/pure_ruby'

[felicityfmn]

This project is for Ruby version 2.4 and newer.
For Ruby versions < 2.4 please file an issue here.

What problems are you experiencing?

I keep getting this error message on the console even though I have the event machine gem installed and the require em/pure_ruby

Steps to reproduce

What's the output from ridk version?

Unable to load the EventMachine C extension; To use the pure-ruby reactor, require 'em/pure_ruby'
C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in require': cannot load such file -- 2.4/rubyeventmachine (LoadError) from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in require'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/eventmachine-1.2.5-x64-mingw32/lib/rubyeventmachine.rb:2:in <top (required)>' from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:133:in require'
from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:133:in rescue in require' from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:39:in require'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/eventmachine-1.2.5-x64-mingw32/lib/eventmachine.rb:8:in <top (required)>' from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:133:in require'
from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:133:in rescue in require' from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:39:in require'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/faye-websocket-0.10.7/lib/faye/websocket.rb:10:in <top (required)>' from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:133:in require'
from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:133:in rescue in require' from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:39:in require'
from C:/Ruby24-x64/flutterbot/play.rb:3:in `

'

[larskanis]

Although eventmachine is provided as x64-mingw platform gem, it doesn't support ruby-2.4 or 2.5 right now. So would recommend you to do the following:

1. Open an issue at eventmachine to update their dependency to rake-compiler-dock-0.6 and to add ruby-2.4 and 2.5 binary support this way and ask them for a new x64-mingw release.
2. Ask the people at eventmachine, how 'em/pure_ruby' is supposed to work.
3. Use gem install eventmachine --platform ruby in the meantime.

[larskanis]

This issue is forwarded to eventmachine here. Closing now. Thank you @felicityfmn !

[isaiasilva]

This problem always occurs ... No convincing answer yet

[Impeck]

gem uninstall eventmachine
gem install eventmachine --platform ruby

[reach2jeyan]

@Impeck It does not work with those commands?

Any probable solutions to these? I believe it only occurred with ruby version more than 2.5 but seems like even in 2.4 that I Installed, I have this error

[Impeck]

To solve the problem specified in the topic you need to run these commands:

gem uninstall eventmachine
gem install eventmachine --platform ruby

[khiav223577]

I have to check whether EventMachine is defined before require em/pure_ruby to prevent getting warnings.

require 'em/pure_ruby' if not defined?(EventMachine)

[EglomSostenes]

To solve the problem specified in the topic you need to run these commands:

gem uninstall eventmachine
gem install eventmachine --platform ruby

Para os BRs: "Resolveu o meu problema"

[pke]

require 'em/pure_ruby' if not defined?(EventMachine)

Where did you put this code @khiav223577?

[khiav223577]

require 'em/pure_ruby' if not defined?(EventMachine)

Where did you put this code @khiav223577?

@pke
I put it at the first line of config/boot.rb in the beginning.

But I use this patch currently:

# config/patch_eventmachine.rb
class Bundler::Runtime
  alias_method :require_without_patching_eventmachine, :require

  def require(*groups)
    begin
      require_without_patching_eventmachine(*groups)
    rescue LoadError => e
      if e.path == '2.5/rubyeventmachine' # when require '2.5/rubyeventmachine' fails
        super 'em/pure_ruby'
        retry
      end

      raise e
    end
  end
end

# config/boot.rb
require_relative 'patch_eventmachine'

...
...

[pke]

I am having this problem when using bundle exec jekyll s. Where would I apply your patch then?

[khiav223577]

I am having this problem when using bundle exec jekyll s. Where would I apply your patch then?

I know nothing about jekyll.
You could submit an issue on jekyll to ask for help.

[Neha5248]

Again n again getting below error
I try to connect cucumber and appium . But not able to do because of this issue