Ruby and Sass installestion error

Upender Sanga <[email protected]>
Newsgroups gmane.comp.mozilla.devel.layout
Message-ID <[email protected]> 
Hello guys..
I have installed Ruby on my windows,
Then i trying to run ruby using "gem install compass".
But it is showing an error as like "certificate verify error"

and same error coming while installing sass.

Plz let me know what is the process to install it..
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