Question

我遇到了麻烦，在rails项目（redmine2.3）中，rails版本是3.2

启动项目

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

错误信息

(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>'

运行rails -v

时会发生同样的错误

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

在项目中运行bundle exec .....会产生相同的错误

问题已经解决，看我在三楼的评论，有答案

Answer 1

我在 Windows 10 上尝试使用 Jekyll 的 LiveReload 功能时遇到此错误消息。此处的其他答案并没有完全解决问题，或者有可能在下次运行 bundle install 时问题再次发生。

我的解决方案（取自 this site）是：

运行这个控制台命令
```
gem uninstall eventmachine 
```
并选择从您的系统中卸载 eventmachine-1.2.7-x64-mingw32 gems。

在项目目录中编辑 Gemfile 并在其中添加以下行：

gem 'eventmachine', '1.2.7', git: 'https://github.com/eventmachine/eventmachine.git', tag: 'v1.2.7'

运行
```
execute bundle install
```
使用命令清理你的 jekyll 构建和缓存
```
bundle exec jekyll clean
```

您现在可以使用 --livereload 参数而不会出现任何问题，即使您将来执行 bundle install。

Answer 2

如果您使用的是Windows

转到此文件夹C:\Ruby24-x64\lib\ruby\gems\2.4.0\gems\eventmachine-1.2.5-x64-mingw32\lib
打开此文件eventmachine.rb
将此require 'em/pure_ruby'写在文件的第一行代码中

这将使其正常工作。

Answer 3

此处的相关错误消息如下：

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

尝试重新安装eventmachine gem：

gem uninstall eventmachine
bundle install

参见Rails/Ruby Error When Creating Database: Unable to load the EventMachine C extension 和 Rails - cannot run app: Unable to load the EventMachine C extension;有关如何处理此问题的更多建议。

Answer 4

问题已解决。

rm vendor/cache/ -rf
bundle install

修正错误

remove the Redundant folder in the redmine/plugins

修正了警告

This is record of locating and repairing process.

总而言之！

Answer 5

gem install eventmachine --platform ruby

Answer 6

对于Windows 10上的Ruby 2.4和eventmachine 1.2.6。

您必须先卸载eventmachine，然后再使用平台ruby再次安装它：

gem uninstall eventmachine  (select all versions if prompted)

gem install eventmachine --platform ruby

无法加载EventMachine C扩展;使用纯红宝石反应器

6 个答案: