我将我的 ruby on rails 应用程序推送到 heroku，但它没有工作，我找不到错误
2013-08-29T14:52:50.796180+00:00 heroku[web.1]: State changed from crashed to starting
2013-08-29T14:52:57.232554+00:00 heroku[web.1]: Starting process with command `bundle exec unicorn -p 9304 -c ./config/unicorn.rb`
2013-08-29T14:53:00.449895+00:00 app[web.1]: I, [2013-08-29T14:53:00.449501 #2] INFO -- : Refreshing Gem list
2013-08-29T14:53:05.906312+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `require': no such file to load -- zip/zip (LoadError)
2013-08-29T14:53:05.906312+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `block in require'
2013-08-29T14:53:05.906312+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:236:in `load_dependency'
2013-08-29T14:53:05.906492+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `require'
2013-08-29T14:53:05.906492+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/axlsx-1.3.6/lib/axlsx.rb:26:in `<top (required)>'
2013-08-29T14:53:05.906492+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.3.2/lib/bundler/runtime.rb:72:in `require'
2013-08-29T14:53:05.906492+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.3.2/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
2013-08-29T14:53:05.906492+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.3.2/lib/bundler/runtime.rb:70:in `each'
2013-08-29T14:53:05.906492+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.3.2/lib/bundler/runtime.rb:70:in `block in require'
2013-08-29T14:53:05.906654+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.3.2/lib/bundler/runtime.rb:59:in `each'
2013-08-29T14:53:05.906654+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.3.2/lib/bundler/runtime.rb:59:in `require'
2013-08-29T14:53:05.906654+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.3.2/lib/bundler.rb:132:in `require'
2013-08-29T14:53:05.906654+00:00 app[web.1]: from /app/config/application.rb:11:in `<top (required)>'
2013-08-29T14:53:05.906745+00:00 app[web.1]: from /app/config/environment.rb:2:in `require'
2013-08-29T14:53:05.906745+00:00 app[web.1]: from /app/config/environment.rb:2:in `<top (required)>'
2013-08-29T14:53:05.906745+00:00 app[web.1]: from config.ru:4:in `require'
2013-08-29T14:53:05.907002+00:00 app[web.1]: from config.ru:4:in `block in <main>'
2013-08-29T14:53:05.907337+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/builder.rb:51:in `instance_eval'
2013-08-29T14:53:05.907337+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/builder.rb:51:in `initialize'
2013-08-29T14:53:05.907337+00:00 app[web.1]: from config.ru:1:in `new'
2013-08-29T14:53:05.907444+00:00 app[web.1]: from config.ru:1:in `<main>'
2013-08-29T14:53:05.907581+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn.rb:48:in `eval'
2013-08-29T14:53:05.907581+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn.rb:48:in `block in builder'
2013-08-29T14:53:05.907683+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:722:in `call'
2013-08-29T14:53:05.907771+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:722:in `build_app!'
2013-08-29T14:53:05.907917+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:140:in `start'
2013-08-29T14:53:05.907917+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/bin/unicorn:126:in `<top (required)>'
2013-08-29T14:53:05.908057+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/bin/unicorn:19:in `load'
2013-08-29T14:53:05.908057+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/bin/unicorn:19:in `<main>'
2013-08-29T14:53:07.333561+00:00 heroku[web.1]: Process exited with status 1
2013-08-29T14:53:07.347096+00:00 heroku[web.1]: State changed from starting to crashed
2013-08-29T14:54:31.437596+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=POST path=/api/GetAllOrdersListCustomer host=xbmonster-dev2.herokuapp.com fwd="181.55.123.18" dyno= connect= service= status=503 bytes=
2013-08-29T14:54:48.207186+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=POST path=/api/mobile/storelist.json host=xbmonster-dev2.herokuapp.com fwd="181.55.123.18" dyno= connect= service= status=503 bytes=