我正在尝试运行此示例：
https://github.com/bbcrd/REST-API-example
但是在尝试运行独角兽时出现此错误：
Renzos-MacBook-Pro:REST-API-example ruenzuo$ unicorn -p 7000
I, [2013-10-22T18:57:24.939197 #763] INFO -- : listening on addr=0.0.0.0:7000 fd=3
I, [2013-10-22T18:57:24.940242 #763] INFO -- : worker=0 spawning...
I, [2013-10-22T18:57:24.941458 #763] INFO -- : master process ready
I, [2013-10-22T18:57:24.942852 #765] INFO -- : worker=0 spawned pid=765
I, [2013-10-22T18:57:24.943437 #765] INFO -- : Refreshing Gem list
/Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:55:in `require': no such file to load -- app (LoadError)
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:55:in `require'
from config.ru:1:in `block in <main>'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/rack-1.2.1/lib/rack/builder.rb:46:in `instance_eval'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/rack-1.2.1/lib/rack/builder.rb:46:in `initialize'
from config.ru:1:in `new'
from config.ru:1:in `<main>'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn.rb:30:in `eval'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn.rb:30:in `block in builder'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:696:in `call'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:696:in `build_app!'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:563:in `init_worker_process'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:578:in `worker_loop'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:495:in `block (2 levels) in spawn_missing_workers'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:492:in `fork'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:492:in `block in spawn_missing_workers'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:488:in `each'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:488:in `spawn_missing_workers'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:502:in `maintain_worker_count'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn/http_server.rb:161:in `start'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/lib/unicorn.rb:13:in `run'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/lib/ruby/gems/1.9.1/gems/unicorn-3.4.0/bin/unicorn:120:in `<top (required)>'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/bin/unicorn:23:in `load'
from /Users/ruenzuo/.rvm/rubies/ruby-1.9.2-p320/bin/unicorn:23:in `<main>'
from /Users/ruenzuo/.rvm/gems/ruby-1.9.2-p320/bin/ruby_executable_hooks:15:in `eval'
from /Users/ruenzuo/.rvm/gems/ruby-1.9.2-p320/bin/ruby_executable_hooks:15:in `<main>'
E, [2013-10-22T18:57:25.040304 #763] ERROR -- : reaped #<Process::Status: pid 765 exit 1> worker=0
当我运行 bundle install 时，我没有问题，这是 gem query --local 的输出：
*** LOCAL GEMS ***
addressable (2.2.4)
bundler (1.3.5)
bundler-unload (1.0.2)
data_objects (0.10.3)
datamapper (1.0.2)
dm-aggregates (1.0.2)
dm-constraints (1.0.2)
dm-core (1.0.2)
dm-do-adapter (1.0.2)
dm-is-state_machine (1.0.2)
dm-migrations (1.0.2)
dm-mysql-adapter (1.0.2)
dm-redis-adapter (0.2.3)
dm-serializer (1.0.2)
dm-sqlite-adapter (1.0.2)
dm-timestamps (1.0.2)
dm-transactions (1.0.2)
dm-types (1.0.2)
dm-validations (1.0.2)
do_mysql (0.10.3)
do_sqlite3 (0.10.3)
executable-hooks (1.2.5)
extlib (0.9.15)
fastercsv (1.5.4)
json (1.5.1)
json_pure (1.5.1)
kgio (2.3.2)
minitest (1.6.0)
mysql2 (0.3.13)
rack (1.2.1)
rack-cache (1.0)
rack-contrib (1.1.0)
rake (0.8.7)
rdoc (2.5.8)
redis (2.1.1)
rubygems-bundler (1.4.0)
rvm (1.11.3.8)
sinatra (1.1.3)
stringex (1.1.0)
systemu (1.2.0)
tilt (1.2.2)
unicorn (3.4.0)
uuidtools (2.1.2)
似乎一切都很好。有任何想法吗？谢谢您的帮助。
更新：
我已经在项目上运行包更新，这是新的 gemfile.lock：
GEM
remote: http://rubygems.org/
specs:
addressable (2.3.5)
bcrypt-ruby (3.1.2)
builder (3.2.2)
data_objects (0.10.13)
addressable (~> 2.1)
datamapper (1.2.0)
dm-aggregates (~> 1.2.0)
dm-constraints (~> 1.2.0)
dm-core (~> 1.2.0)
dm-migrations (~> 1.2.0)
dm-serializer (~> 1.2.0)
dm-timestamps (~> 1.2.0)
dm-transactions (~> 1.2.0)
dm-types (~> 1.2.0)
dm-validations (~> 1.2.0)
dm-aggregates (1.2.0)
dm-core (~> 1.2.0)
dm-constraints (1.2.0)
dm-core (~> 1.2.0)
dm-core (1.2.1)
addressable (~> 2.3)
dm-do-adapter (1.2.0)
data_objects (~> 0.10.6)
dm-core (~> 1.2.0)
dm-is-state_machine (1.2.0)
dm-core (~> 1.2.0)
dm-migrations (1.2.0)
dm-core (~> 1.2.0)
dm-mysql-adapter (1.2.0)
dm-do-adapter (~> 1.2.0)
do_mysql (~> 0.10.6)
dm-redis-adapter (0.8.4)
dm-core (>= 1.2.0)
dm-types (>= 1.2.0)
dm-validations (>= 1.2.0)
hiredis (~> 0.4.0)
jeweler (>= 1.4.0)
rake (>= 10.0.3)
redis (>= 3.0.4)
rspec (~> 1.3.2)
dm-serializer (1.2.2)
dm-core (~> 1.2.0)
fastercsv (~> 1.5)
json (~> 1.6)
json_pure (~> 1.6)
multi_json (~> 1.0)
dm-sqlite-adapter (1.2.0)
dm-do-adapter (~> 1.2.0)
do_sqlite3 (~> 0.10.6)
dm-timestamps (1.2.0)
dm-core (~> 1.2.0)
dm-transactions (1.2.0)
dm-core (~> 1.2.0)
dm-types (1.2.2)
bcrypt-ruby (~> 3.0)
dm-core (~> 1.2.0)
fastercsv (~> 1.5)
json (~> 1.6)
multi_json (~> 1.0)
stringex (~> 1.4)
uuidtools (~> 2.1)
dm-validations (1.2.0)
dm-core (~> 1.2.0)
do_mysql (0.10.13)
data_objects (= 0.10.13)
do_sqlite3 (0.10.13)
data_objects (= 0.10.13)
extlib (0.9.16)
faraday (0.8.8)
multipart-post (~> 1.2.0)
fastercsv (1.5.5)
git (1.2.6)
github_api (0.10.1)
addressable
faraday (~> 0.8.1)
hashie (>= 1.2)
multi_json (~> 1.4)
nokogiri (~> 1.5.2)
oauth2
hashie (2.0.5)
highline (1.6.20)
hiredis (0.4.5)
httpauth (0.2.0)
jeweler (1.8.8)
builder
bundler (~> 1.0)
git (>= 1.2.5)
github_api (= 0.10.1)
highline (>= 1.6.15)
nokogiri (= 1.5.10)
rake
rdoc
json (1.8.1)
json_pure (1.8.1)
jwt (0.1.8)
multi_json (>= 1.5)
kgio (2.8.1)
multi_json (1.8.2)
multi_xml (0.5.5)
multipart-post (1.2.0)
nokogiri (1.5.10)
oauth2 (0.9.2)
faraday (~> 0.8)
httpauth (~> 0.2)
jwt (~> 0.1.4)
multi_json (~> 1.0)
multi_xml (~> 0.5)
rack (~> 1.2)
rack (1.5.2)
rack-cache (1.2)
rack (>= 0.4)
rack-contrib (1.1.0)
rack (>= 0.9.1)
rack-protection (1.5.1)
rack
raindrops (0.12.0)
rake (10.1.0)
rdoc (4.0.1)
json (~> 1.4)
redis (3.0.5)
rspec (1.3.2)
sinatra (1.4.4)
rack (~> 1.4)
rack-protection (~> 1.4)
tilt (~> 1.3, >= 1.3.4)
stringex (1.5.1)
systemu (2.5.2)
tilt (1.4.1)
unicorn (4.6.3)
kgio (~> 2.6)
rack
raindrops (~> 0.7)
uuidtools (2.1.4)
PLATFORMS
ruby
DEPENDENCIES
data_objects
datamapper
dm-aggregates
dm-constraints
dm-core
dm-is-state_machine
dm-migrations
dm-mysql-adapter
dm-redis-adapter
dm-serializer
dm-sqlite-adapter
dm-timestamps
dm-types
dm-validations
do_mysql
do_sqlite3
extlib
json
rack-cache
rack-contrib
sinatra
systemu
unicorn