我已将 rails 项目克隆到我的本地计算机中。然后我使用bundle install命令安装了所有需要的 gem。但是当我尝试启动服务器时，出现错误：
`polyglot_original_require': no such file to load -- eventmachine (MissingSourceFile)
当我跑步时，gem list我可以在那里找到eventmachine宝石。那么有什么问题呢？这是完整的堆栈跟踪：
/.rvm/gems/ruby-1.8.7-p371/gems/polyglot-0.3.3/lib/polyglot.rb:63:in `polyglot_original_require': no such file to load -- eventmachine (MissingSourceFile)
from /home/oleksandr/.rvm/gems/ruby-1.8.7-p371/gems/polyglot-0.3.3/lib/polyglot.rb:63:in `require'
from /home/oleksandr/dev/salamstein/vendor/rails/activesupport/lib/active_support/dependencies.rb:182:in `require'
from /home/oleksandr/dev/salamstein/vendor/rails/activesupport/lib/active_support/dependencies.rb:547:in `new_constants_in'
from /home/oleksandr/dev/salamstein/vendor/rails/activesupport/lib/active_support/dependencies.rb:182:in `require'
from /home/oleksandr/.rvm/gems/ruby-1.8.7-p371/gems/thin-2.0.0.pre/lib/thin/server.rb:1
from /home/oleksandr/.rvm/gems/ruby-1.8.7-p371/gems/polyglot-0.3.3/lib/polyglot.rb:63:in `polyglot_original_require'
from /home/oleksandr/.rvm/gems/ruby-1.8.7-p371/gems/polyglot-0.3.3/lib/polyglot.rb:63:in `require'
from /home/oleksandr/dev/salamstein/vendor/rails/activesupport/lib/active_support/dependencies.rb:182:in `require'
from /home/oleksandr/dev/salamstein/vendor/rails/activesupport/lib/active_support/dependencies.rb:547:in `new_constants_in'
from /home/oleksandr/dev/salamstein/vendor/rails/activesupport/lib/active_support/dependencies.rb:182:in `require'
from /home/oleksandr/.rvm/gems/ruby-1.8.7-p371/gems/thin-2.0.0.pre/lib/thin.rb:3
from /home/oleksandr/.rvm/gems/ruby-1.8.7-p371@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
from /home/oleksandr/.rvm/gems/ruby-1.8.7-p371@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
from /home/oleksandr/.rvm/gems/ruby-1.8.7-p371@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
from /home/oleksandr/.rvm/gems/ruby-1.8.7-p371@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `require'
from /home/oleksandr/.rvm/gems/ruby-1.8.7-p371@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
from /home/oleksandr/.rvm/gems/ruby-1.8.7-p371@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
from /home/oleksandr/.rvm/gems/ruby-1.8.7-p371@global/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
from /home/oleksandr/dev/salamstein/config/boot.rb:122:in `load_gems'
from /home/oleksandr/dev/salamstein/config/../vendor/rails/railties/lib/initializer.rb:164:in `process'
from /home/oleksandr/dev/salamstein/config/../vendor/rails/railties/lib/initializer.rb:113:in `send'
from /home/oleksandr/dev/salamstein/config/../vendor/rails/railties/lib/initializer.rb:113:in `run'
from /home/oleksandr/dev/salamstein/config/environment.rb:45
from /home/oleksandr/dev/salamstein/vendor/rails/activesupport/lib/active_support/dependencies.rb:182:in `require'
from /home/oleksandr/dev/salamstein/vendor/rails/activesupport/lib/active_support/dependencies.rb:182:in `require'
from /home/oleksandr/dev/salamstein/vendor/rails/activesupport/lib/active_support/dependencies.rb:547:in `new_constants_in'
from /home/oleksandr/dev/salamstein/vendor/rails/activesupport/lib/active_support/dependencies.rb:182:in `require'
from /home/oleksandr/dev/salamstein/vendor/rails/railties/lib/commands/server.rb:84
from script/server:3:in `require'
from script/server:3
谢谢你。