Can't install calabash with gem


When I check the version of gem, I get

C:>gem --version

When I try to install Calabash, I get a LoadError

C:>gem install calabash-android
ERROR: Loading command: install (LoadError)
cannot load such file – openssl
ERROR: While executing gem … (NoMethodError)
undefined method `invoke_with_build_args’ for nil:NilClass

I am using Windows 7 and using ruby version ruby 2.0.0p247 (2013-06-27)

Can someone tell me what this error means, and how I can get pass
through it.