I have installed Ruby on my system, and now I want to install Compass. But when I execute the gem install compass command, it shows an error like this:

could not find valid gem 'compass' <>=0> in any repositary

And also:

SocketError: getadressinfo: no such host is known.<http://rubygems.org/latest_specs.4.8.gz>

I don't know what the problem is. If I run ruby -v, it shows the Ruby version. So what's the problem with installing Compass?

Can anyone explain this to me properly? I've searched Google, but all I could find was some proxy problem - and I couldn't understand how to set the proxy at all.

I'm using Windows and a company internet connection, so I don't know the username and password of my proxy.

compass-sass ruby-1.9.3
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