我无法让heroku使用我的应用程序。它工作了一段时间，我不知道是什么改变了它，但我不能为我的生活做好准备。以下是日志文件：
2016-06-26T17:18:34.982596+00:00 heroku[api]: Release v7 created by evanliewer@gmail.com
2016-06-26T17:18:34.982497+00:00 heroku[api]: Deploy da3be34 by evanliewer@gmail.com
2016-06-26T17:18:37.841303+00:00 heroku[web.1]: Starting process with command `bin/rails server -p 35056 -e production`
2016-06-26T17:18:37.981807+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2016-06-26T17:18:38.758316+00:00 app[web.1]: /app/vendor/ruby-2.3.0/lib/ruby/2.3.0/webrick/server.rb:177:in `block in start'
2016-06-26T17:18:38.758294+00:00 app[web.1]: [2016-06-26 17:18:38] FATAL SignalException: SIGTERM
2016-06-26T17:18:38.758314+00:00 app[web.1]: /app/vendor/ruby-2.3.0/lib/ruby/2.3.0/webrick/server.rb:177:in `select'
2016-06-26T17:18:38.758320+00:00 app[web.1]: /app/vendor/bundle/ruby/2.3.0/gems/railties-4.2.6/lib/rails/commands/server.rb:80:in `start'
2016-06-26T17:18:38.758318+00:00 app[web.1]: /app/vendor/ruby-2.3.0/lib/ruby/2.3.0/webrick/server.rb:164:in `start'
2016-06-26T17:18:38.758320+00:00 app[web.1]: /app/vendor/bundle/ruby/2.3.0/gems/rack-1.6.4/lib/rack/server.rb:286:in `start'
2016-06-26T17:18:38.758322+00:00 app[web.1]: /app/vendor/bundle/ruby/2.3.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:80:in `block in server'
2016-06-26T17:18:38.758319+00:00 app[web.1]: /app/vendor/bundle/ruby/2.3.0/gems/rack-1.6.4/lib/rack/handler/webrick.rb:34:in `run'
2016-06-26T17:18:38.758324+00:00 app[web.1]: /app/vendor/bundle/ruby/2.3.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
2016-06-26T17:18:38.758317+00:00 app[web.1]: /app/vendor/ruby-2.3.0/lib/ruby/2.3.0/webrick/server.rb:33:in `start'
2016-06-26T17:18:38.758324+00:00 app[web.1]: /app/vendor/bundle/ruby/2.3.0/gems/railties-4.2.6/lib/rails/commands.rb:17:in `<top (required)>'
2016-06-26T17:18:38.758322+00:00 app[web.1]: /app/vendor/bundle/ruby/2.3.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:75:in `tap'
2016-06-26T17:18:38.758323+00:00 app[web.1]: /app/vendor/bundle/ruby/2.3.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:75:in `server'
2016-06-26T17:18:38.758358+00:00 app[web.1]: [2016-06-26 17:18:38] INFO WEBrick::HTTPServer#start done.
2016-06-26T17:18:38.769022+00:00 app[web.1]: => Booting WEBrick
2016-06-26T17:18:38.758325+00:00 app[web.1]: bin/rails:9:in `require'
2016-06-26T17:18:38.758326+00:00 app[web.1]: bin/rails:9:in `<main>'
2016-06-26T17:18:38.758331+00:00 app[web.1]: [2016-06-26 17:18:38] INFO going to shutdown ...
2016-06-26T17:18:38.769041+00:00 app[web.1]: => Ctrl-C to shutdown server
2016-06-26T17:18:38.769039+00:00 app[web.1]: => Rails 4.2.6 application starting in production on http://0.0.0.0:47180
2016-06-26T17:18:38.769041+00:00 app[web.1]: => Run `rails server -h` for more startup options
2016-06-26T17:18:38.769045+00:00 app[web.1]: Exiting
2016-06-26T17:18:39.708029+00:00 heroku[web.1]: Process exited with status 143
2016-06-26T17:18:41.645018+00:00 app[web.1]: [2016-06-26 17:18:41] INFO WEBrick::HTTPServer#start: pid=3 port=35056
2016-06-26T17:18:41.644736+00:00 app[web.1]: [2016-06-26 17:18:41] INFO WEBrick 1.3.1
2016-06-26T17:18:41.644764+00:00 app[web.1]: [2016-06-26 17:18:41] INFO ruby 2.3.0 (2015-12-25) [x86_64-linux]
2016-06-26T17:18:41.896336+00:00 heroku[web.1]: State changed from starting to up