我部署了Rails应用程序，但是当我打开它时，我在Web浏览器中收到此错误：
应用程序错误应用程序中发生错误，无法保存您的页面 . 如果您是应用程序所有者，请检查日志以获取详细信息 .
这是我的日志错误：
2018-03-19T04：48：12.360662 00:00 heroku [router]：at = error code = H10 desc =“App crashed”method = GET path =“/”host = marmelade1.herokuapp.com request_id = 613511e2-940f -4aac-8f42-7fa7f85a8a76 fwd =“172.90.196.64”dyno = connect = service = status = 503 bytes = protocol = https 2018-03-19T04：48：31.712091 00:00 heroku [router]：at = error code = H10 desc =“App crashed”method = GET path =“/”host = marmelade1.herokuapp.com request_id = 813d50a1-8cee-4a57-81d5-b9f303084cf6 fwd =“172.90.196.64”dyno = connect = service = status = 503 bytes = protocol = https 2018-03-19T04：48：32.039194 00:00 heroku [router]：at = error code = H10 desc =“App crashed”method = GET path =“/ favicon.ico”host = marmelade1.herokuapp.com request_id = 854ceb16-62c4-430e-9771-d64bb334f006 fwd =“172.90.196.64”dyno = connect = service = status = 503 bytes = protocol = https 2018-03-19T05：01：26.721459 00:00 heroku [router]：at =错误代码= H10 desc =“App crashed”方法= GET path =“/”host = marmelade1.herokuapp.com request_id = e112728e-af23-48c1-aef2-c2fd995466dd fwd =“172.90.196.64” dyno = connect = service = status = 503 bytes = protocol = https
我究竟做错了什么？