Rails/Ruby Error When Creating Database: Unable to load the EventMachine C extension

Question

Update:

the eventmachine gem is installed and in my gemfile:

 eventmachine (1.0.0, 0.12.10)

Please help! Trying to create a database with the following:

Fitzs-MacBook-Pro:twilio_insanity Fitz$ rake db:create'

Returns the following error:

Unable to load the EventMachine C extension; To use the pure-ruby reactor, require 'em/pure_ruby' rake aborted! cannot load such file -- rubyeventmachine /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@rails3tutorial2ndEd/gems/eventmachine-1.0.0/lib/eventmachine.rb:8:in require' /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@rails3tutorial2ndEd/gems/eventmachine-1.0.0/lib/eventmachine.rb:8:in ' /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@rails3tutorial2ndEd/gems/thin-1.5.0/lib/thin.rb:7:in require' /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@rails3tutorial2ndEd/gems/thin-1.5.0/lib/thin.rb:7:in ' /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in require' /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in block (2 levels) in require' /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in each' /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in block in require' /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in each' /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in require' /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler.rb:128:in require' /Users/Fitz/Desktop/twilio_insanity/config/application.rb:7:in' /Users/Fitz/Desktop/twilio_insanity/Rakefile:5:in require' /Users/Fitz/Desktop/twilio_insanity/Rakefile:5:in' /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@rails3tutorial2ndEd/bin/ruby_noexec_wrapper:14:in eval' /Users/Fitz/.rvm/gems/ruby-1.9.3-p327@rails3tutorial2ndEd/bin/ruby_noexec_wrapper:14:in ' (See full trace by running task with --trace)

```

Answer 1

try to re-install the gem 'eventmachine'

$ gem uninstall eventmachine

then

$ bundle install  ( in the same folder with your Gemfile) 

or just

$ gem install eventmachine ( if you are not using the Gemfile) 

see: https://stackoverflow.com/a/15140634/445908

Answer 2

Someone kind of answered in comments...see below.

Basically though I had seperate versions of Ruby, which was getting confusing because some gems were only installed on certain versions of ruby.

Fix was totally uninstalling ruby and rails, then reinstalling. Fixed it!

This helped:

This comment in another thread seems promising for your issue. Can you ensure that you have "gem eventmachine" or similar in your Gemfile, and can successfully bundle? – Scott Helm Jan 6 at 6:24