按照本教程，一切都在本地進(jìn)行。將我的應(yīng)用程序部署到 Heroku 并在瀏覽器上訪(fǎng)問(wèn)該應(yīng)用程序后，我收到503 錯(cuò)誤和消息：應(yīng)用程序錯(cuò)誤 應(yīng)用程序發(fā)生錯(cuò)誤，無(wú)法提供您的頁(yè)面。請(qǐng)稍后重試。如果您是應(yīng)用程序所有者，請(qǐng)檢查您的日志以了解詳細(xì)信息。日志說(shuō)：2015-09-08T16:31:53.976824+00:00 heroku[web.1]: State changed from crashed to starting2015-09-08T16:31:56.174376+00:00 heroku[web.1]: Starting process with command `mywebsite`2015-09-08T16:31:59.312461+00:00 app[web.1]: Listening on port: 394612015-09-08T16:32:56.471550+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch2015-09-08T16:32:56.471550+00:00 heroku[web.1]: Stopping process with SIGKILL2015-09-08T16:32:57.390752+00:00 heroku[web.1]: Process exited with status 1372015-09-08T16:32:57.404208+00:00 heroku[web.1]: State changed from starting to crashed2015-09-08T16:32:57.645135+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=boiling-eyrie-6897.herokuapp.com request_id=ec26... fwd="xx.xxx.xxx.xxx" dyno= connect= service= status=503 bytes=2015-09-08T16:32:58.233774+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=boiling-eyrie-6897.herokuapp.com request_id=ef40...fwd="xx.xxx.xxx.xxx" dyno= connect= service= status=503 bytes=我明白錯(cuò)誤是什么，但這么小的教程應(yīng)用程序怎么會(huì)導(dǎo)致啟動(dòng)超時(shí)（R10）？如何更好地調(diào)試并修復(fù)應(yīng)用程序以使其運(yùn)行？