Rails Unicorn server crashing?

Rails Unicorn server crashing?

Trying to deploy my Rails app on DigitalOcean using a Unicorn Rails
server, and getting some error I can't interpret:
root@blog:/home/rails# tail -40 /home/unicorn/log/unicorn.log
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/definition.rb:148:in
`requested_specs'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/environment.rb:18:in
`requested_specs'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/runtime.rb:13:in
`setup'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/bundler-1.3.5/lib/bundler.rb:120:in
`setup'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/setup.rb:17:in
`<top (required)>'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:60:in
`require'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:60:in
`rescue in require'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:35:in
`require'
/home/rails/config/boot.rb:6:in `<top (required)>'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
/home/rails/config/application.rb:1:in `<top (required)>'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
/home/rails/config/environment.rb:2:in `<top (required)>'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
config.ru:4:in `block in <main>'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/rack-
1.4.5/lib/rack/builder.rb:51:in `instance_eval'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/rack-1.4.5/lib/rack/builder.rb:51:in
`initialize'
config.ru:1:in `new'
config.ru:1:in `<main>'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/unicorn-4.6.3/lib/unicorn.rb:48:in
`eval'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/unicorn-4.6.3/lib/unicorn.rb:48:in
`block in builder'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:722:in
`call'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:722:in
`build_app!'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:595:in
`init_worker_process'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:615:in
`worker_loop'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:500:in
`spawn_missing_workers'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:511:in
`maintain_worker_count'
/usr/local/rvm/rubies/ruby-1.9.3-p429/lib/ruby/gems/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:277:in
`join'
/usr/bin/unicorn:121:in `<main>'
E, [2013-09-15T00:28:11.016488 #11684] ERROR -- : reaped
#<Process::Status: pid 16029 exit 1> worker=1
I, [2013-09-15T00:28:11.016608 #11684] INFO -- : worker=1 spawning...
E, [2013-09-15T00:28:11.018269 #11684] ERROR -- : reaped
#<Process::Status: pid 16031 exit 1> worker=0
I, [2013-09-15T00:28:11.018385 #11684] INFO -- : worker=0 spawning...
I, [2013-09-15T00:28:11.019306 #16035] INFO -- : worker=1 spawned pid=16035
I, [2013-09-15T00:28:11.021522 #16037] INFO -- : worker=0 spawned pid=16037
I, [2013-09-15T00:28:11.023002 #16035] INFO -- : Refreshing Gem list
I, [2013-09-15T00:28:11.027851 #16037] INFO -- : Refreshing Gem list
I followed the tutorial here:
https://www.digitalocean.com/community/articles/how-to-launch-your-ruby-on-rails-app-with-the-digitalocean-one-click-image
Any idea what could be wrong or where to start looking?