Problem with installing Diaspora* - database schema fails

I am trying to install Diaspora* on my WebFaction account. I have edited the database.yml file and entered my database username, password, and database name in the 'production:' section. However, when I run 'RAILS_ENV=production bundle exec rake db:schema:load' I get the following error message:

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[RailsAdmin] RailsAdmin initialization disabled by default. Pass SKIP_RAILS_ADMIN_INITIALIZER=false if you need it.
rake aborted!
syntax error on line 73, col 4: `    s3: ## Section'

Tasks: TOP => db:schema:load => environment
(See full trace by running task with --trace)

Where am I going wrong?