this is what i see from the unicorn error log:
E, [2014-03-02T15:27:43.334218 #2773] ERROR -- : reaped # worker=1
I, [2014-03-02T15:27:43.334663 #2773] INFO -- : worker=1 spawning...
I, [2014-03-02T15:27:43.341445 #31282] INFO -- : worker=1 spawned pid=31282
I, [2014-03-02T15:27:43.347471 #31282] INFO -- : Refreshing Gem list
/usr/local/rvm/gems/ruby-2.0.0-p353/gems/bundler-1.3.5/lib/bundler/runtime.rb:33:in `block in setup': You have already activated rack 1.5.2, but your Gemfile requires rack 1.4.5. Using bundle exec may solve this. (Gem::LoadError)
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/bundler-1.3.5/lib/bundler/runtime.rb:19:in `setup'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/bundler-1.3.5/lib/bundler.rb:120:in `setup'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/bundler-1.3.5/lib/bundler/setup.rb:17:in `'
from /usr/local/rvm/rubies/ruby-2.0.0-p353/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:135:in `require'
from /usr/local/rvm/rubies/ruby-2.0.0-p353/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
from /usr/local/rvm/rubies/ruby-2.0.0-p353/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:144:in `require'
from /var/www/apps/lga/releases/20140225181502/config/boot.rb:6:in `'
from /usr/local/rvm/rubies/ruby-2.0.0-p353/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/rvm/rubies/ruby-2.0.0-p353/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /var/www/apps/lga/releases/20140225181502/config/application.rb:1:in `'
from /usr/local/rvm/rubies/ruby-2.0.0-p353/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/rvm/rubies/ruby-2.0.0-p353/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /var/www/apps/lga/releases/20140225181502/config/environment.rb:2:in `'
from /usr/local/rvm/rubies/ruby-2.0.0-p353/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/rvm/rubies/ruby-2.0.0-p353/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from config.ru:4:in `block in '
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/rack-1.5.2/lib/rack/builder.rb:55:in `instance_eval'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/rack-1.5.2/lib/rack/builder.rb:55:in `initialize'
from config.ru:1:in `new'
from config.ru:1:in `'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/unicorn-4.7.0/lib/unicorn.rb:48:in `eval'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/unicorn-4.7.0/lib/unicorn.rb:48:in `block in builder'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:750:in `call'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:750:in `build_app!'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:623:in `init_worker_process'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:643:in `worker_loop'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:527:in `spawn_missing_workers'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:538:in `maintain_worker_count'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/unicorn-4.7.0/lib/unicorn/http_server.rb:303:in `join'
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/unicorn-4.7.0/bin/unicorn:126:in `'
from /usr/local/rvm/gems/ruby-2.0.0-p353/bin/unicorn:23:in `load'
from /usr/local/rvm/gems/ruby-2.0.0-p353/bin/unicorn:23:in `'
from /usr/local/rvm/gems/ruby-2.0.0-p353/bin/ruby_executable_hooks:15:in `eval'
from /usr/local/rvm/gems/ruby-2.0.0-p353/bin/ruby_executable_hooks:15:in `'
E, [2014-03-02T15:27:43.424026 #2773] ERROR -- : reaped # worker=0
I, [2014-03-02T15:27:43.424524 #2773] INFO -- : worker=0 spawning...
I, [2014-03-02T15:27:43.427174 #31285] INFO -- : worker=0 spawned pid=31285
I, [2014-03-02T15:27:43.433696 #31285] INFO -- : Refreshing Gem list