Rails　Herokuデプロイ時にエラーが出る

herokuにてデプロイ時にエラーが出ます！

調べてみたのですが
回答が見つかりません！
お助けお願いします。。

wd="160.237.73.39" dyno=web.1 connect=1ms service=126ms status=500 bytes=1827 protocol=https
2020-08-27T11:59:26.860904+00:00 heroku[router]: at=info method=GET path="/favicon.ico" host=books-28291.herokuapp.com request_id=4ec7bdc8-e074-448d-a24b-5e53005bd2d3 fwd="160.237.73.39" dyno=web.1 connect=1ms service=6ms status=200 bytes=143 protocol=https
2020-08-27T12:33:05.132027+00:00 heroku[web.1]: Idling
2020-08-27T12:33:05.133752+00:00 heroku[web.1]: State changed from up to down
2020-08-27T12:33:06.412035+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2020-08-27T12:33:06.472091+00:00 app[web.1]: - Gracefully stopping, waiting for requests to finish
2020-08-27T12:33:06.482869+00:00 app[web.1]: === puma shutdown: 2020-08-27 12:33:06 +0000 ===
2020-08-27T12:33:06.482872+00:00 app[web.1]: - Goodbye!
2020-08-27T12:33:06.483087+00:00 app[web.1]: Exiting
2020-08-27T12:33:06.610001+00:00 heroku[web.1]: Process exited with status 143
2020-08-28T01:23:08.916310+00:00 heroku[web.1]: State changed from down to starting