当我尝试使用bundler 时，出现错误：
/home/vivek/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': 无法加载此类文件 -- openssl (LoadError )
完整的错误消息如下。我该如何解决？
Fetching gem metadata from https://rubygems.org/.Unfortunately, a fatal error has occurred. Please report this error to the Bundler issue tracker at https://github.com/carlhuda/bundler/issues so that we can fix it. Please include the full output of the command, your Gemfile and Gemfile.lock. Thanks!
/home/vivek/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- openssl (LoadError)
from /home/vivek/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /home/vivek/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/net/https.rb:22:in `<top (required)>'
from /home/vivek/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /home/vivek/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /home/vivek/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.3/lib/bundler/vendor/net/http/persistent.rb:447:in `ssl'
from /home/vivek/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.3/lib/bundler/vendor/net/http/persistent.rb:216:in `connection_for' …