我不明白这里发生了什么。
我在 postgresql 数据库上使用 ruby on rails 构建了我的网站。
它在本地服务器上完美运行。
但我刚刚将它部署到 Heroku，我收到了这个错误；
仅供参考，我按照 Heroku 网站上的建议创建了一个 procfile。
应用程序错误
应用程序发生错误，无法提供您的页面。请稍后重试。
如果您是应用程序所有者，请查看您的日志以获取详细信息。
2013-06-26T03:02:07.421697+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
2013-06-26T03:02:07.421506+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `get'
2013-06-26T03:02:07.421506+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
2013-06-26T03:02:07.421697+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
2013-06-26T03:02:07.421506+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler/thin.rb:1:in `<top (required)>'
2013-06-26T03:02:07.421506+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `inject'
2013-06-26T03:02:07.421697+00:00 app[web.1]: from script/rails:6:in `require'
2013-06-26T03:02:07.421697+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
2013-06-26T03:02:07.421697+00:00 app[web.1]: from script/rails:6:in `<main>'
2013-06-26T03:02:07.421697+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/server.rb:272:in `server'
2013-06-26T03:02:07.439117+00:00 app[web.1]: Exiting
2013-06-26T03:02:07.421506+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `block in get'
2013-06-26T03:02:07.421697+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands/server.rb:59:in `start'
2013-06-26T03:02:08.750717+00:00 heroku[web.1]: Process exited with status 1
2013-06-26T03:02:08.745131+00:00 heroku[web.1]: State changed from starting to crashed
2013-06-26T03:12:15.338756+00:00 heroku[web.1]: Starting process with command `bundle exec rails server thin -p 47851 -e $RACK_ENV`
2013-06-26T03:12:21.836547+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
2013-06-26T03:12:21.836547+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands/server.rb:59:in `start'
2013-06-26T03:12:21.836349+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- thin (LoadError)
2013-06-26T03:12:21.836349+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `get'
2013-06-26T03:12:21.836349+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
2013-06-26T03:12:21.836349+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `each'
2013-06-26T03:12:21.836349+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `const_get'
2013-06-26T03:12:21.836349+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler/thin.rb:1:in `<top (required)>'
2013-06-26T03:12:21.836547+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/server.rb:272:in `server'
2013-06-26T03:12:21.836349+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
2013-06-26T03:12:21.836349+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `inject'
2013-06-26T03:12:21.836547+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
2013-06-26T03:12:21.836349+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
2013-06-26T03:12:21.836547+00:00 app[web.1]: from script/rails:6:in `require'
2013-06-26T03:12:21.836349+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `block in get'
2013-06-26T03:12:21.836547+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
2013-06-26T03:12:21.836547+00:00 app[web.1]: from script/rails:6:in `<main>'
2013-06-26T03:12:21.865436+00:00 app[web.1]: Exiting
2013-06-26T03:12:23.663577+00:00 heroku[web.1]: Process exited with status 1
2013-06-26T03:12:23.677322+00:00 heroku[web.1]: State changed from starting to crashed
2013-06-26T03:22:43.460462+00:00 heroku[web.1]: State changed from crashed to starting
2013-06-26T03:22:48.976685+00:00 heroku[web.1]: Starting process with command `bundle exec rails server thin -p 30463 -e $RACK_ENV`
2013-06-26T03:22:54.590985+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `each'
2013-06-26T03:22:54.591157+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
2013-06-26T03:22:54.590985+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `block in get'
2013-06-26T03:22:54.590985+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- thin (LoadError)
2013-06-26T03:22:54.590985+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
2013-06-26T03:22:54.590985+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `const_get'
2013-06-26T03:22:54.591157+00:00 app[web.1]: from script/rails:6:in `<main>'
2013-06-26T03:22:54.590985+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `get'
2013-06-26T03:22:54.591157+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/server.rb:272:in `server'
2013-06-26T03:22:54.591157+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
2013-06-26T03:22:54.590985+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
2013-06-26T03:22:54.590985+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
2013-06-26T03:22:54.590985+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler/thin.rb:1:in `<top (required)>'
2013-06-26T03:22:54.590985+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `inject'
2013-06-26T03:22:54.591157+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
2013-06-26T03:22:54.591157+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands/server.rb:59:in `start'
2013-06-26T03:22:54.591157+00:00 app[web.1]: from script/rails:6:in `require'
2013-06-26T03:22:54.621142+00:00 app[web.1]: Exiting
2013-06-26T03:22:55.841091+00:00 heroku[web.1]: Process exited with status 1
2013-06-26T03:22:55.859629+00:00 heroku[web.1]: State changed from starting to crashed
2013-06-26T03:32:48.892316+00:00 heroku[web.1]: State changed from crashed to starting
2013-06-26T03:32:52.032180+00:00 heroku[web.1]: Starting process with command `bundle exec rails server thin -p 58591 -e $RACK_ENV`
2013-06-26T03:32:54.409527+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
2013-06-26T03:32:54.409527+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `const_get'
2013-06-26T03:32:54.409527+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- thin (Load
Error)
2013-06-26T03:32:54.409527+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
2013-06-26T03:32:54.409527+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
2013-06-26T03:32:54.409527+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `inject'
2013-06-26T03:32:54.409527+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler/thin.rb:1:in `<top (required)>'
2013-06-26T03:32:54.409527+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `block in get'
2013-06-26T03:32:54.409527+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `each'
2013-06-26T03:32:54.409527+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `get'
2013-06-26T03:32:54.409728+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/server.rb:272:in `server'
2013-06-26T03:32:54.426193+00:00 app[web.1]: Exiting
2013-06-26T03:32:54.409728+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
2013-06-26T03:32:54.409728+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
2013-06-26T03:32:54.409728+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands/server.rb:59:in `start'
2013-06-26T03:32:54.409728+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
2013-06-26T03:32:54.409728+00:00 app[web.1]: from script/rails:6:in `require'
2013-06-26T03:32:54.409728+00:00 app[web.1]: from script/rails:6:in `<main>'
2013-06-26T03:32:55.409933+00:00 heroku[web.1]: Process exited with status 1
2013-06-26T03:32:55.424202+00:00 heroku[web.1]: State changed from starting to crashed
2013-06-26T03:42:57.889181+00:00 heroku[web.1]: State changed from crashed to starting
2013-06-26T03:43:02.239973+00:00 heroku[web.1]: Starting process with command `bundle exec rails server thin -p 56589 -e $RACK_ENV`
2013-06-26T03:43:05.359693+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
2013-06-26T03:43:05.359693+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
2013-06-26T03:43:05.359693+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler/thin.rb:1:in `<top (required)>'
2013-06-26T03:43:05.359693+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `const_get'
2013-06-26T03:43:05.359693+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `block in get'
2013-06-26T03:43:05.359693+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `each'
2013-06-26T03:43:05.359693+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `inject'
2013-06-26T03:43:05.359693+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `get'
2013-06-26T03:43:05.359889+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/server.rb:272:in `server'
2013-06-26T03:43:05.359889+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands/server.rb:59:in `start'
2013-06-26T03:43:05.359889+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
2013-06-26T03:43:05.359889+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
2013-06-26T03:43:05.359889+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
2013-06-26T03:43:05.359889+00:00 app[web.1]: from script/rails:6:in `require'
2013-06-26T03:43:05.359889+00:00 app[web.1]: from script/rails:6:in `<main>'
2013-06-26T03:43:05.378536+00:00 app[web.1]: Exiting
2013-06-26T03:43:06.587742+00:00 heroku[web.1]: Process exited with status 1
2013-06-26T03:43:05.359693+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- thin (LoadError)
2013-06-26T03:43:05.359693+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'