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我刚刚部署了我的 rails 应用程序，但我无法启动应用程序。在heroku ps:scale web=1我看到该应用程序崩溃后。

上次申请日志：

←[36m2013-06-21T09:23:23.207330+00:00 app[web.1]:←[0m   -q, [--quiet]    # Suppress status output
←[36m2013-06-21T09:23:23.214381+00:00 app[web.1]:←[0m     defaults values shown above in this help message.
←[36m2013-06-21T09:23:23.214381+00:00 app[web.1]:←[0m
←[36m2013-06-21T09:23:23.214607+00:00 app[web.1]:←[0m     This generates a skeletal Rails installation in ~/Code/Ruby/weblog.
←[36m2013-06-21T09:23:23.214607+00:00 app[web.1]:←[0m     See the README in the newly created application to get going.
←[36m2013-06-21T09:23:23.207330+00:00 app[web.1]:←[0m   -f, [--force]    # Overwrite files that already exist
←[36m2013-06-21T09:23:23.214381+00:00 app[web.1]:←[0m     Note that the arguments specified in the .railsrc file don't affect the
←[36m2013-06-21T09:23:23.214381+00:00 app[web.1]:←[0m
←[36m2013-06-21T09:23:23.214381+00:00 app[web.1]:←[0m     You can specify extra command-line arguments to be used every time
←[36m2013-06-21T09:23:23.207330+00:00 app[web.1]:←[0m   -v, [--version]  # Show Rails version number and quit
←[36m2013-06-21T09:23:23.214381+00:00 app[web.1]:←[0m
←[36m2013-06-21T09:23:23.214607+00:00 app[web.1]:←[0m Example:
←[36m2013-06-21T09:23:23.214607+00:00 app[web.1]:←[0m     rails new ~/Code/Ruby/weblog
←[36m2013-06-21T09:23:23.214607+00:00 app[web.1]:←[0m
←[36m2013-06-21T09:23:24.271458+00:00 heroku[web.1]:←[0m Process exited with status 0
←[36m2013-06-21T09:23:24.281002+00:00 heroku[web.1]:←[0m State changed from starting to crashed

更新

我的宝石文件

gem 'rails', '4.0.0.rc1'
gem 'pg'
gem 'sass-rails', '~> 4.0.0.rc1'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.0.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 1.0.1'
group :doc do
  gem 'sdoc', require: false
end
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