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

Asked 6/6, 2015 at 11:58 Answered 19/12, 2021 at 21:48

ruby-on-rails ruby ruby-on-rails-3 bundle

i got trouble, in a rails project（redmine2.3), rails version is 3.2

start the project

bundle exec thin start -p 8080 -e production -s 5 -d

error info

(eval):9: warning: already initialized constant Bundler::Dsl::RAILS_VERSION_IS_3
(eval):9: warning: previous definition of RAILS_VERSION_IS_3 was here
(eval):9: warning: already initialized constant Bundler::Dsl::RAILS_VERSION_IS_3
(eval):9: warning: previous definition of RAILS_VERSION_IS_3 was here
Unable to load the EventMachine C extension; To use the pure-ruby reactor, require 'em/pure_ruby'
/var/wtn/vendor/cache/ruby/2.0.0/gems/eventmachine-1.0.3/lib/eventmachine.rb:8:in `require': libruby.so.2.0: cannot open shared object file: No such file or directory - /var/wtn/vendor/cache/ruby/2.0.0/gems/eventmachine-1.0.3/lib/rubyeventmachine.so (LoadError)
    from /var/wtn/vendor/cache/ruby/2.0.0/gems/eventmachine-1.0.3/lib/eventmachine.rb:8:in `<top (required)>'
    from /var/wtn/vendor/cache/ruby/2.0.0/gems/thin-1.6.2/lib/thin.rb:7:in `require'
    from /var/wtn/vendor/cache/ruby/2.0.0/gems/thin-1.6.2/lib/thin.rb:7:in `<top (required)>'
    from /var/wtn/vendor/cache/ruby/2.0.0/gems/thin-1.6.2/bin/thin:5:in `require'
    from /var/wtn/vendor/cache/ruby/2.0.0/gems/thin-1.6.2/bin/thin:5:in `<top (required)>'
    from /var/wtn/vendor/cache/ruby/2.0.0/bin/thin:23:in `load'
    from /var/wtn/vendor/cache/ruby/2.0.0/bin/thin:23:in `<main>'

the same error happens when running rails -v

rails -v
(eval):9: warning: already initialized constant Bundler::Dsl::RAILS_VERSION_IS_3
(eval):9: warning: previous definition of RAILS_VERSION_IS_3 was here

running bundle exec ..... in the project produces the same error

the problem has solved, see my comment in the third floor , there are the answer

Placeeda answered 6/6, 2015 at 11:58 Comment(2)

possible duplicate of Rails - cannot run app: Unable to load the EventMachine C extension; – Mi 6/6, 2015 at 13:46

not the same, see my comment in the third floor , there are the answer – Placeeda 6/6, 2015 at 16:30

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:

Run this console command
```
gem uninstall eventmachine 
```
and choose to uninstall eventmachine-1.2.7-x64-mingw32 gems from your system.

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'

Run
```
bundle install
```
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.

Tenebrific answered 3/1, 2021 at 5:47 Comment(6)

Thanks @Simon East – Mum 11/8, 2021 at 22:30

Thanks, I'm also encountering this error message on Windows 10 while trying to use Jekyll's LiveReload feature and it works for me as well. – Glasscock 14/10, 2021 at 14:2

@EvenWonder Hey did you just add the code on the first line of the gem file? bundle exec jekyll clean didn't work for me – Rosebay 1/1, 2022 at 7:41

@SarahV.P Hey, have you found out the solution? I think the last line is more appropriate. Besides, bundle exec jekyll clean is just to clean some auto generated files, there is no relationship between them. – Glasscock 2/1, 2022 at 6:51

And if this doesn't work, https://mcmap.net/q/392499/-i-can-39-t-install-eventmachine-gem-on-mac-m1 might help – Alphard 13/3, 2023 at 16:13

This solved my issue, love ya – Congruous 2/5 at 23:56

If you are using windows

Go to this folder C:\Ruby24-x64\lib\ruby\gems\2.4.0\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.

Stonefly answered 31/10, 2018 at 9:27 Comment(7)

Save my life, uninstall and install do not work for me! – Outmaneuver 24/4, 2021 at 13:20

It gave me the following error -

The ``SortedSet`` class has been extracted from the ``set`` library.You must use the ``sorted_set`` gem or other alternatives. (RuntimeError)

. On my machine the path to the file you specified is - C:\Ruby30-x64\lib\ruby\gems\3.0.0\gems\eventmachine-1.2.7-x64-mingw32\lib – Serilda 15/7, 2021 at 5:6

I also have this issue – Nabob 28/9, 2021 at 22:12

I'm with the same issue here – Resurge 1/11, 2021 at 0:43

worked with ruby-3.0.1 and eventmachine-1.2.7 on macos – Landscapist 21/12, 2021 at 12:12

it worked for a while, I received a subsequent error C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/eventmachine-1.2.7-x64-mingw32/lib/em/pure_ruby.rb:559:in `close': Bad file descriptor – Golly 1/1, 2022 at 5:49

For MacOS: /Library/Ruby/Gems/2.6.0/gems/eventmachine-1.2.7/lib/rubyeventmachine.b – Diphenylhydantoin 8/4, 2022 at 3:39

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

Mignonne answered 3/11, 2019 at 19:32 Comment(1)

Doesn't work for MacOS for eventmachine 1.2.7 – Alphard 13/3, 2023 at 16:14

The relevant error message here is the following:

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

Try to reinstall the eventmachine gem:

gem uninstall eventmachine
bundle install

See Rails/Ruby Error When Creating Database: Unable to load the EventMachine C extension and Rails - cannot run app: Unable to load the EventMachine C extension; for more advice on how to deal with this issue.

Keratogenous answered 6/6, 2015 at 12:44 Comment(5)

what about the warning: (eval):9: warning: already initialized constant Bundler::Dsl::RAILS_VERSION_IS_3 (eval):9: warning: previous definition of RAILS_VERSION_IS_3 was here – Placeeda 6/6, 2015 at 12:45

gem uninstall eventmachine seems got no tips back – Placeeda 6/6, 2015 at 13:38

I also tried this but received the exact same error message. – Aldon 26/6, 2018 at 3:24

I am getting this error ERROR: While executing gem ... (Gem::DependencyRemovalException) Uninstallation aborted due to dependent gem(s) – Marmara 12/10, 2018 at 11:44

@YashuMittal See #953336 for some tips on how to move past this error. – Keratogenous 12/10, 2018 at 17:59

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

Fencesitter answered 19/12, 2021 at 21:48 Comment(0)

The problem has fixed.

rm vendor/cache/ -rf
bundle install

fixed the error

remove the Redundant folder in the redmine/plugins

fixed the warnings

This is record of locating and repairing process.

thx all!

Placeeda answered 6/6, 2015 at 16:14 Comment(0)

gem install eventmachine --platform ruby

Bowls answered 10/4, 2018 at 20:20 Comment(2)

Try to explain at least a little? – Agriculture 10/4, 2018 at 20:48

Before uninstall eventmachine with gem uninstall eventmachine: github.com/oneclick/rubyinstaller2/issues/… – Moleskin 18/3, 2019 at 8:39

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