eventmachine gem已安装在我的gemfile中：

eventmachine (1.0.0,0.12.10)@H_404_5@ 
 
请帮忙！尝试使用以下内容创建数据库：
 
  
 
Fitzs-MacBook-Pro:twilio_insanity Fitz$rake db:create'@H_404_5@ 
 
返回以下错误：
 
  
 
 
  
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)
 
 
 
 
“`