Error whilst trying to deploy app with Capistrano


I'm trying to deploy my application with Capistrano. But when I try to
execute this:

cap deploy:setup

It gives me this error:

Is it because my "deploy_to" option isn't set in my deploy config
How should I set it to deploy to my "rails_apps/#{applicationname}"
folder (that's been created by CPanel)

Or what is exactly causing this error?

Thank you,