Я не понимаю, почему эта ошибка приложения.Я следовал учебному пособию djangogirls-extension .
Вот вывод > записей логов heroku --tail --app srms-demo command
2019-02-09T02:31:06.000000+00:00 app[api]: Build failed -- check your build output: https://dashboard.heroku.com/apps/9822ee2e-0b33-4163-9dd1-5d9897a5b7c7/activity/builds/e01929d2-7a31-45fe-97c3-90eab053a667
2019-02-09T02:47:00.587192+00:00 heroku[run.9364]: State changed from up to complete
2019-02-09T02:50:39.686144+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=srms-demo.herokuapp.com request_id=5859852f-3ae2-47c8-9f6e-3ba05f1c5bbb fwd="43.245.123.100" dyno= connect= service= status=503 bytes= protocol=https
2019-02-09T03:10:39.561398+00:00 heroku[run.2791]: Process exited with status 0
2019-02-09T03:11:20.141798+00:00 heroku[run.6801]: State changed from up to complete
2019-02-09T03:15:30.610720+00:00 heroku[web.1]: State changed from crashed to starting
затем посещается ошибка ссылка и находит это
-----> Python app detected
! Requested runtime (python-3.7) is not available for this stack (heroku-18).
! Aborting. More info: https://devcenter.heroku.com/articles/python-support
! Push rejected, failed to compile Python app.
! Push failed
Обновление
После изменения runtime.txt на python-3.7.1 нажал на мастер Heroku
здесь вывод logos heroku --tail --app srms-demo команда
2019-02-09T02:31:06.000000+00:00 app[api]: Build failed -- check your build output: https://dashboard.heroku.com/apps/9822ee2e-0b33-4163-9dd1-5d9897a5b7c7/activity/builds/e01929d2-7a31-45fe-97c3-90eab053a667
2019-02-09T02:47:00.587192+00:00 heroku[run.9364]: State changed from up to complete
2019-02-09T02:50:39.686144+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=srms-demo.herokuapp.com request_id=5859852f-3ae2-47c8-9f6e-3ba05f1c5bbb fwd="43.245.123.100" dyno= connect= service= status=503 bytes= protocol=https
2019-02-09T03:10:39.561398+00:00 heroku[run.2791]: Process exited with status 0
2019-02-09T03:11:20.141798+00:00 heroku[run.6801]: State changed from up to complete
2019-02-09T03:15:30.610720+00:00 heroku[web.1]: State changed from crashed to starting
2019-02-09T06:28:53.311604+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=srms-demo.herokuapp.com request_id=04075507-aa74-4f7b-b303-081b50c4d876 fwd="116.58.205.24" dyno= connect= service= status=503 bytes= protocol=https