herokuでデプロイしてもWe're sorry, but something went wrong.がでる

前提・実現したいこと

https://www.m3tech.blog/entry/2017/10/05/103507のサイトをもとにアプリをつくっていました。
herokuでアプリをデプロイしているといきなりWe're sorry, but something went wrong.がでました。
色々なサイトの解決方法を試しましたが治りません。heroku run rails db:migrateもやっています。

発生している問題・エラーメッセージ

We're sorry, but something went wrong.

logの内容

uby/2.5.0/gems/rack-2.0.7/lib/rack/sendfile.rb:111:in `call'
2019-09-09T00:33:46.861550+00:00 app[web.1]: [183862bc-970a-461c-aec0-defbef57943c] vendor/bundle/ruby/y/2.5.0/gems/railties-5.2.3/lib/rails/engine.rb:524:in `call'
2019-09-09T00:33:46.861552+00:00 app[web.1]: [183862bc-970a-461c-aec0-defbef57943c] vendor/bundle/ruby/y/2.5.0/gems/puma-3.12.1/lib/puma/configuration.rb:227:in `call'
2019-09-09T00:33:46.861558+00:00 app[web.1]: [183862bc-970a-461c-aec0-defbef57943c] vendor/bundle/ruby/y/2.5.0/gems/puma-3.12.1/lib/puma/server.rb:660:in `handle_request'
2019-09-09T00:33:46.861560+00:00 app[web.1]: [183862bc-970a-461c-aec0-defbef57943c] vendor/bundle/ruby/y/2.5.0/gems/puma-3.12.1/lib/puma/server.rb:474:in `process_client'
2019-09-09T00:33:46.861562+00:00 app[web.1]: [183862bc-970a-461c-aec0-defbef57943c] vendor/bundle/ruby/y/2.5.0/gems/puma-3.12.1/lib/puma/server.rb:334:in `block in run'
2019-09-09T00:33:46.861564+00:00 app[web.1]: [183862bc-970a-461c-aec0-defbef57943c] vendor/bundle/ruby/y/2.5.0/gems/puma-3.12.1/lib/puma/thread_pool.rb:135:in `block in spawn_thread'
2019-09-09T00:33:47.277460+00:00 heroku[router]: at=info method=GET path="/favicon.ico" host=rocky-refufuge-42772.herokuapp.com request_id=fe9186c1-8e9d-4d03-adfe-03d70201a400 fwd="126.159.251.241" dyno=w.1eb.1 connect=0ms service=1ms status=304 bytes=48 protocol=https
2019-09-09T00:37:46.563385+00:00 app[api]: Starting process with command `rails db:migrate` by user amemezisuto.murasaki@gmail.com
2019-09-09T00:37:51.488321+00:00 heroku[run.7798]: Awaiting client
2019-09-09T00:37:51.511266+00:00 heroku[run.7798]: Starting process with command `rails db:migrate`201919-09-09T00:37:51.679282+00:00 heroku[run.7798]: State changed from starting to up
2019-09-09T00:37:57.742488+00:00 heroku[run.7798]: State changed from up to complete
2019-09-09T00:37:57.710573+00:00 heroku[run.7798]: Process exited with status 0
2019-09-09T01:05:12.613888+00:00 heroku[web.1]: Idling
2019-09-09T01:05:12.653051+00:00 heroku[web.1]: State changed from up to down
2019-09-09T01:05:16.807646+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2019-09-09T01:05:16.827635+00:00 app[web.1]: - Gracefully stopping, waiting for requests to finish
2019-09-09T01:05:16.828325+00:00 app[web.1]: === puma shutdown: 2019-09-09 01:05:16 +0000 ===
2019-09-09T01:05:16.828354+00:00 app[web.1]: - Goodbye!
2019-09-09T01:05:16.828467+00:00 app[web.1]: Exiting
2019-09-09T01:05:16.946237+00:00 heroku[web.1]: Process exited with status 143