Unable to load the EventMachine C extension; To use the pure-ruby reactor, require 'em/pure_ruby' #96

felicityfmn · 2018-01-30T09:41:07Z

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 `

'

The text was updated successfully, but these errors were encountered:

larskanis · 2018-01-30T10:27:27Z

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:

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.
Ask the people at eventmachine, how 'em/pure_ruby' is supposed to work.
Use gem install eventmachine --platform ruby in the meantime.

larskanis · 2018-02-24T22:11:42Z

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

isaiasilva · 2018-09-14T04:17:46Z

This problem always occurs ... No convincing answer yet

Impeck · 2018-10-24T12:08:48Z

gem uninstall eventmachine
gem install eventmachine --platform ruby

reach2jeyan · 2018-10-31T09:23:58Z

@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 · 2018-10-31T09:33:53Z

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

gem uninstall eventmachine
gem install eventmachine --platform ruby

khiav223577 · 2019-10-31T07:38:22Z

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 · 2020-01-24T23:49:57Z

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"

oneclick/rubyinstaller2#96

pke · 2020-05-07T00:26:49Z

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

Where did you put this code @khiav223577?

khiav223577 · 2020-05-07T09:23:26Z

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 · 2020-05-09T00:35:56Z

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

khiav223577 · 2020-05-09T07:37:03Z

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 · 2020-08-24T15:13:50Z

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

MSP-Greg · 2020-08-24T15:44:31Z

@Neha5248

For Ruby 2.5 and later, try:

gem uninstall eventmachine
ridk exec pacman -Sy openssl
gem install eventmachine --platform=ruby

ridk exec pacman -Sy openssl updates MSYS2 and installs the MSYS2 openssl package. This may take a little while...

gem install eventmachine --platform=ruby installs EventMachine but forces compiling the gem

EventMachine's current x64-mingw32 gem is not compatible with Ruby 2.6 and later, and it was accidentally built without that information in the gemspec.

Ruby 2.5 and later use OpenSSL 1.1.1. Ruby 2.4 uses OpenSSL 1.0.2, which requires a different set of commands.

Neha5248 · 2020-08-24T16:02:25Z

@MSP-Greg

Thank a lot it's working fine now :)

reach2jeyan · 2020-08-25T09:19:01Z

If you are using windows

Go to this folder C:\Ruby24-x64\lib\ruby\gems\{version of ruby}\gems\eventmachine-1.2.5-x64-mingw32\lib

open this file eventmachine.rb

write this require 'em/pure_ruby' in the first line of code in the file
this will make it work with no issues.

makubex88 · 2020-10-03T20:25:06Z

gem uninstall eventmachine
gem install eventmachine --platform ruby

this works on my end.

vincerubinetti · 2021-04-18T19:01:20Z

For those running into this problem with Jekyll's live-reload (bundle exec jekyll serve --livereload), I tried combining several of the above solutions:

Completely uninstall Ruby and MSYS2
Install Ruby and MSYS2 with Ruby Installer Ruby+Devkit 2.7.2-1 (x64)
gem uninstall eventmachine and choose all to uninstall
ridk exec pacman -Sy openssl (run in Command Prompt, not Git Bash or some other shell)
gem install eventmachine --platform ruby
Open C:\Ruby27-x64\lib\ruby\gems\2.7.0\gems\eventmachine-1.2.7-x64-mingw32\lib\eventmachine.rb
Insert require 'em/pure_ruby' if not defined?(EventMachine) at the top of the file

This ALMOST works, but it still crashes after a few reloads:

trace

#<Thread:0x0000000007c892c0 C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/jekyll-4.2.0/lib/jekyll/commands/serve/live_reload_reactor.rb:41 run> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
        7: from C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/jekyll-4.2.0/lib/jekyll/commands/serve/live_reload_reactor.rb:44:in `block in start'
        6: from C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/eventmachine-1.2.7-x64-mingw32/lib/eventmachine.rb:197:in `run'
        5: from C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/eventmachine-1.2.7-x64-mingw32/lib/em/pure_ruby.rb:144:in `run_machine' 
        4: from C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/eventmachine-1.2.7-x64-mingw32/lib/em/pure_ruby.rb:547:in `run'
        3: from C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/eventmachine-1.2.7-x64-mingw32/lib/em/pure_ruby.rb:547:in `loop'        
        2: from C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/eventmachine-1.2.7-x64-mingw32/lib/em/pure_ruby.rb:553:in `block in run'        1: from C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/eventmachine-1.2.7-x64-mingw32/lib/em/pure_ruby.rb:595:in `crank_selectables'
C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/eventmachine-1.2.7-x64-mingw32/lib/em/pure_ruby.rb:595:in `select': Bad file descriptor 
(Errno::EBADF)

Really wish this issue was fixed... upstream or wherever the problem lies.

EDIT: This solution actually seems to work for me. None of the above steps needed, just one line added to Gem file. It still seems to throw the same errors, but it doesn't prevent the site from being refreshed.

SeaDude · 2021-06-12T03:04:57Z

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:

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.

Ask the people at eventmachine, how 'em/pure_ruby' is supposed to work.

Use gem install eventmachine --platform ruby in the meantime.

Interesting that this is still required a few years later.

Fresh install on Windows 10 following official Quickstart docs
Running:
jekyll new eblog
cd eblog
bundle exec jekyll serve
Fails with:

C:/Ruby30-x64/lib/ruby/gems/3.0.0/gems/jekyll-4.2.0/lib/jekyll/commands/serve/servlet.rb:3:in `require': cannot load such file -- webrick (LoadError)

Ran bundle add webrick
Then bundle exec jekyll serve
Fails with:

Unable to load the EventMachine C extension; To use the pure-ruby reactor, require 'em/pure_ruby'
                    ------------------------------------------------
      Jekyll 4.2.0   Please append `--trace` to the `serve` command
                     for any additional information or backtrace.
                    ------------------------------------------------
C:/Ruby30-x64/lib/ruby/gems/3.0.0/gems/eventmachine-1.2.7-x64-mingw32/lib/rubyeventmachine.rb:2:in `require': cannot load such file -- 3.0/rubyeventmachine (LoadError)

Tried running bundle add rubyeventmachine

Could not find gem 'rubyeventmachine' in rubygems repository
https://rubygems.org/ or installed locally.
The source does not contain any versions of 'rubyeventmachine'

Found this Github issue and ran gem install eventmachine --platform ruby
Now bundle exec jekyll serve serves up the website as intended.

spaquet · 2021-12-19T21:49:20Z

What worked for me on Apple Silicon M1 and Rails 6.1

Full uninstall of eventmachine: gem uninstall -aIx eventmachine followed by a rm -rf vendor/cache
Add eventmachine in the project Gemfile and forcing it to be from the master branch latest like this gem 'eventmachine', :git => 'git://github.com/eventmachine/eventmachine.git', :branch => 'master'
Run bundle install

Lojlk · 2022-01-01T07:34:36Z

@Neha5248

For Ruby 2.5 and later, try:
gem uninstall eventmachine
ridk exec pacman -Sy openssl
gem install eventmachine --platform=ruby
ridk exec pacman -Sy openssl updates MSYS2 and installs the MSYS2 openssl package. This may take a little while...

gem install eventmachine --platform=ruby installs EventMachine but forces compiling the gem

EventMachine's current x64-mingw32 gem is not compatible with Ruby 2.6 and later, and it was accidentally built without that information in the gemspec.

Ruby 2.5 and later use OpenSSL 1.1.1. Ruby 2.4 uses OpenSSL 1.0.2, which requires a different set of commands.

Hi Greg, I followed your steps (am using Ruby 2.7.5) and "bundle exec jekyll serve --livereload" was met with Could not find eventmachine-1.2.7-x64-mingw32 in any of the sources. Any solutions? Thanks

FredyRosero · 2022-01-30T19:07:26Z

I had that error when I run bundle exec jekyll serve --livereload --trace on Jekyll.4.2.1-Ruby.3.0.3p137(mingw)-Windows. I ran gem install eventmachine --platform=ruby and it compiled at C:\Ruby30-x64\lib\ruby\gems\3.0.0\gems\eventmachine-1.2.7 but when you run bundle install it creates also C:\Ruby30-x64\lib\ruby\gems\3.0.0\gems\eventmachine-1.2.7-x64-mingw32 🤔. The command bundle info eventmachine gives me C:/Ruby30-x64/lib/ruby/gems/3.0.0/gems/eventmachine-1.2.7-x64-mingw32 and that's confimed in the Gemfile.lock with the line eventmachine (1.2.7-x64-mingw32). So I changed that line for eventmachine (1.2.7) and then the output of bundle info eventmachine gives me C:/Ruby30-x64/lib/ruby/gems/3.0.0/gems/eventmachine-1.2.7 and finally the command bundle exec jekyll serve --livereload --trace worked ✔️

larskanis closed this as completed Feb 24, 2018

pacphi mentioned this issue Feb 5, 2019

Get cf-uaac installed in Windows 10/2016 pacphi/pcftools#3

Closed

malmeloo mentioned this issue Apr 25, 2019

no implicit conversion of nil into String (TypeError) Smashing/smashing#131

Closed

rodrigoargumedo mentioned this issue Apr 13, 2020

Add Event Machine into Gemfile jekyll/jekyll#8111

Closed

ELHAMLAOUI mentioned this issue Apr 13, 2020

Local running on windows 10: Unable to load the EventMachine C extension academicpages/academicpages.github.io#117

Closed

devstopfix added a commit to devstopfix/elixoids that referenced this issue Apr 22, 2020

Use pure ruby em

e4b12e1

oneclick/rubyinstaller2#96

cooperka mentioned this issue May 27, 2020

Explicitly require eventmachine (for homebrew) thecartercenter/nemo#735

Merged

rompic mentioned this issue Jul 1, 2020

Eventmachine on windows Smashing/smashing#166

Closed

MSP-Greg mentioned this issue Sep 10, 2020

Jekyll wont appear as a recognized interal or external command #188

Closed

vincerubinetti mentioned this issue Mar 25, 2021

Advanced instructions: Previewing and building the site and citations locally greenelab/lab-website-template#34

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sietseringers mentioned this issue Apr 15, 2021

Throws error and exits on Apple silicon sj26/mailcatcher#455

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vincerubinetti mentioned this issue Apr 18, 2021

jekyll --livereload gives bad file descriptor error in Windows eventmachine/eventmachine#869

Open

kevin-roe mentioned this issue May 19, 2021

Can EventMachine be built to be compatible with Ruby 2.6+ on Windows? eventmachine/eventmachine#945

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AnshumanTripathi mentioned this issue Jul 24, 2021

Debugger fails on apple m1 ruby-debug/ruby-debug-ide#219

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kitokazu mentioned this issue Mar 16, 2023

Added issues with M1 mac and 'npm install' to README chapmanu/cascade-assets#789

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Unable to load the EventMachine C extension; To use the pure-ruby reactor, require 'em/pure_ruby' #96

Unable to load the EventMachine C extension; To use the pure-ruby reactor, require 'em/pure_ruby' #96

felicityfmn commented Jan 30, 2018

larskanis commented Jan 30, 2018

larskanis commented Feb 24, 2018

isaiasilva commented Sep 14, 2018

Impeck commented Oct 24, 2018

reach2jeyan commented Oct 31, 2018

Impeck commented Oct 31, 2018

khiav223577 commented Oct 31, 2019

EglomSostenes commented Jan 24, 2020

pke commented May 7, 2020 •

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khiav223577 commented May 7, 2020

pke commented May 9, 2020

khiav223577 commented May 9, 2020

Neha5248 commented Aug 24, 2020 •

edited

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MSP-Greg commented Aug 24, 2020 •

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Neha5248 commented Aug 24, 2020

reach2jeyan commented Aug 25, 2020 •

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makubex88 commented Oct 3, 2020

vincerubinetti commented Apr 18, 2021 •

edited

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SeaDude commented Jun 12, 2021

spaquet commented Dec 19, 2021

Lojlk commented Jan 1, 2022

FredyRosero commented Jan 30, 2022

Unable to load the EventMachine C extension; To use the pure-ruby reactor, require 'em/pure_ruby' #96

Unable to load the EventMachine C extension; To use the pure-ruby reactor, require 'em/pure_ruby' #96

Comments

felicityfmn commented Jan 30, 2018

What problems are you experiencing?

Steps to reproduce

What's the output from ridk version?

larskanis commented Jan 30, 2018

larskanis commented Feb 24, 2018

isaiasilva commented Sep 14, 2018

Impeck commented Oct 24, 2018

reach2jeyan commented Oct 31, 2018

Impeck commented Oct 31, 2018

khiav223577 commented Oct 31, 2019

EglomSostenes commented Jan 24, 2020

pke commented May 7, 2020 • edited Loading

khiav223577 commented May 7, 2020

pke commented May 9, 2020

khiav223577 commented May 9, 2020

Neha5248 commented Aug 24, 2020 • edited Loading

MSP-Greg commented Aug 24, 2020 • edited Loading

Neha5248 commented Aug 24, 2020

reach2jeyan commented Aug 25, 2020 • edited Loading

makubex88 commented Oct 3, 2020

vincerubinetti commented Apr 18, 2021 • edited Loading

SeaDude commented Jun 12, 2021

spaquet commented Dec 19, 2021

Lojlk commented Jan 1, 2022

FredyRosero commented Jan 30, 2022

What's the output from `ridk version`?

pke commented May 7, 2020 •

edited

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Neha5248 commented Aug 24, 2020 •

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MSP-Greg commented Aug 24, 2020 •

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reach2jeyan commented Aug 25, 2020 •

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