unicorn@homer:/var/tools/keyword-observer$ RAILS_ENV=production bundle exec unicorn -c config/unicorn.rb

returns this error:

I, [2011-02-24T14:43:13.237605 #25908]  INFO -- : unlinking existing socket=/var/rails/keyword-observer/tmp/sockets/unicorn.sock
I, [2011-02-24T14:43:13.237838 #25908]  INFO -- : listening on addr=/var/rails/keyword-observer/tmp/sockets/unicorn.sock fd=5
I, [2011-02-24T14:43:13.237918 #25908]  INFO -- : Refreshing Gem list
master process ready
config/unicorn.rb:20:in `block in reload': uninitialized constant ActiveRecord (NameError)
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:560:in `call'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:560:in `init_worker_process'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:578:in `worker_loop'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:495:in `block (2 levels) in spawn_missing_workers'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:492:in `fork'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:492:in `block in spawn_missing_workers'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:488:in `each'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:488:in `spawn_missing_workers'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:502:in `maintain_worker_count'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:161:in `start'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/gems/unicorn-3.4.0/lib/unicorn.rb:13:in `run'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/gems/unicorn-3.4.0/bin/unicorn:120:in `<top (required)>'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/bin/unicorn:19:in `load'
	from /usr/local/rvm/gems/ruby-1.9.2-p136@keyword-observer/bin/unicorn:19:in `<main>'