我已将我的rails应用程序部署到heroku，现在我正在尝试使用＆＃34; heroku open＆＃34;打开它，但是我收到错误＆＃34;应用程序中出现错误，您的页面可以没有送达。如果您是应用程序所有者，请检查日志以获取详细信息。＆＃34;。这些是日志：
2017-12-26T18:40:16.269452+00:00 app[web.1]: => Booting Puma
2017-12-26T18:40:16.261939+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/command/base.rb:63:in `perform'
2017-12-26T18:40:16.261951+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/command.rb:44:in `invoke'
2017-12-26T18:40:16.269455+00:00 app[web.1]: => Rails 5.1.4 application starting in production
2017-12-26T18:40:16.261978+00:00 app[web.1]: from bin/rails:9:in `require'
2017-12-26T18:40:16.269456+00:00 app[web.1]: Exiting
2017-12-26T18:40:16.269455+00:00 app[web.1]: => Run `rails server -h` for more startup options
2017-12-26T18:40:16.372189+00:00 heroku[web.1]: State changed from starting to crashed
2017-12-26T18:40:16.359435+00:00 heroku[web.1]: Process exited with status 1
2017-12-26T18:40:16.911232+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=pacific-stream-77985.herokuapp.com request_id=60caaad5-f16e-4443-8b8f-e278d41d966d fwd="2.104.49.204" dyno= connect= service= status=503 bytes= protocol=https
2017-12-26T18:40:57.610077+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=pacific-stream-77985.herokuapp.com request_id=9b3b9601-d003-49fd-8661-fd4494f84632 fwd="2.104.49.204" dyno= connect= service= status=503 bytes= protocol=https
2017-12-26T18:45:46.508705+00:00 heroku[run.1739]: Awaiting client
2017-12-26T18:45:46.560426+00:00 heroku[run.1739]: Starting process with command `rails db:migrate`
2017-12-26T18:45:46.570612+00:00 heroku[run.1739]: State changed from starting to up
2017-12-26T18:45:42.507797+00:00 app[api]: Starting process with command `rails db:migrate` by user <mymail>@gmail.com
2017-12-26T18:45:53.393255+00:00 heroku[run.1739]: Process exited with status 0
2017-12-26T18:45:53.406858+00:00 heroku[run.1739]: State changed from up to complete
2017-12-26T18:46:09.405442+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=pacific-stream-77985.herokuapp.com request_id=e38838f5-294c-45eb-a936-81f89e8fed2d fwd="2.104.49.204" dyno= connect= service= status=503 bytes= protocol=https