[Rails] Help me about Paperclip

I want to upload,dowload image in RoR and i know Paperclip can help me
it.But i can't setup Paperlist in Win dow to run application.This is
link i am learning
http://codeabout.wordpress.com/2011/03/08/gem-paperclip-uploading-files-and-pictures-into-your-rails-application/.Could
you help me...Thanks

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