herokuにpushするとエラーしてしまう

ローカルだとうまくいくのですが，herokuへpushするとこのようなエラーが出てしまいます

motegiyuuta:new-cajino motegiyuta$ heroku logs --tail
2019-07-03T07:16:20.048515+00:00 heroku[web.1]: Stopping process with SIGKILL
2019-07-03T07:16:20.130957+00:00 heroku[web.1]: Process exited with status 137
2019-07-03T07:25:16.415492+00:00 heroku[web.1]: State changed from crashed to starting
2019-07-03T07:25:19.314070+00:00 heroku[web.1]: Starting process with command `npm start`
2019-07-03T07:25:21.363089+00:00 app[web.1]:
2019-07-03T07:25:21.363116+00:00 app[web.1]: > kkk@1.0.0 start /app
2019-07-03T07:25:21.363118+00:00 app[web.1]: > node server.js
2019-07-03T07:25:21.363120+00:00 app[web.1]:
2019-07-03T07:25:21.924750+00:00 app[web.1]: Bot server start!
2019-07-03T07:26:20.085353+00:00 heroku[web.1]: State changed from starting to crashed
2019-07-03T07:26:19.903193+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT
within 60 seconds of launch

2019-07-03T07:26:19.903329+00:00 heroku[web.1]: Stopping process with SIGKILL
2019-07-03T07:26:20.064500+00:00 heroku[web.1]: Process exited with status 137
2019-07-03T07:31:53.549676+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=c
ajino.herokuapp.com request_id=f03ca0df-dde3-4c0c-bc3c-2f3b7e861747 fwd="182.158.70.171" dyno= connect= service=
 status=503 bytes= protocol=https
2019-07-03T07:31:54.277079+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.
ico" host=cajino.herokuapp.com request_id=467300f1-21c0-45c8-8db5-019b96d48493 fwd="182.158.70.171" dyno= connec
t= service= status=503 bytes= protocol=https