Compressing the original image stored by Paperclip.

i am trying to compress the original image stored by paperclip using smusher on my local machine but i am getting this (getaddrinfo: Name or service not known (ypoweb-01.experf.gq1.yahoo.com:80). i want to know the proper way of how to compress the paperclip original images using smusher or punypng or is there any other way to compress those images.and

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