我无法通过heroku看到我的网站。为什么？有什么问题？ 我的日志是：
2017-01-07T09：01：05.406777 + 00:00 heroku [web.1]：已退出状态为137的进程 2017-01-07T09：01：05.418855 + 00:00 heroku [web.1]：状态由开始变为崩溃 2017-01-07T09：01：06.670282 + 00:00 heroku [router]：at = error code = H10 desc =“App crashed”method = GET path =“/”host = progettocloud.herokuapp.com request_id = 3cab0568-3af9 -47da-8f98-ed8828db9b3a fwd =“151.18.21.88”dyno = connect = service = status = 503 bytes = 2017-01-07T09：01：06.872148 + 00:00 heroku [router]：at = error code = H10 desc =“App crashed”method = GET path =“/”host = progettocloud.herokuapp.com request_id = d2af6b74-852d -4edc-b4aa-9575222788ff fwd =“151.18.21.88”dyno = connect = service = status = 503 bytes = 2017-01-07T09：01：07.301323 + 00:00 heroku [router]：at = error code = H10 desc =“App crashed”method = GET path =“/ favicon.ico”host = progettocloud.herokuapp.com request_id = 5b02133c-9589-4645-a625-37a4b4f6e4b2 fwd =“151.18.21.88”dyno = connect = service = status = 503 bytes = 2017-01-07T09：01：07.329927 + 00:00 heroku [router]：at = error code = H10 desc =“App crashed”method = GET path =“/”host = progettocloud.herokuapp.com request_id = 9f4497ae-0288 -4cca-ac07-c24a627ba36a fwd =“151.18.21.88”dyno = connect = service = status = 503 bytes = 2017-01-07T09：01：08.813181 + 00:00 heroku [router]：at = error code = H10 desc =“App crashed”method = GET path =“/”host = progettocloud.herokuapp.com request_id = db394667-435d -4711-8986-9c17984fac08 fwd =“151.18.21.88”dyno = connect = service = status = 503 bytes = 2017-01-07T09：01：52.416224 + 00:00 heroku [router]：at = error code = H10 desc =“App crashed”method = GET path =“/”host = progettocloud.herokuapp.com request_id = 180677b2-c4d8 -4af0-84a8-e3ede4af8f52 fwd =“151.18.21.88”dyno = connect = service = status = 503 bytes = 2017-01-07T09：01：52.783132 + 00:00 heroku [router]：at = error code = H10 desc =“App crashed”method = GET path =“/ favicon.ico”host = progettocloud.herokuapp.com request_id = 7bd9234b-f394-4efd-934e-907d6e28618f fwd =“151.18.21.88”dyno = connect = service = status = 503 bytes = 2017-01-07T09：10：35.609452 + 00:00 heroku [router]：at = error code = H10 desc =“App crashed”method = GET path =“/”host = progettocloud.herokuapp.com request_id = 02dfd2dc-cb74 -4f09-9e87-a08ad9e26758 fwd =“151.18.21.88”dyno = connect = service = status = 503 bytes = 2017-01-07T09：10：36.216100 + 00:00 heroku [router]：at = error code = H10 desc =“App crashed”method = GET path =“/ favicon.ico”host = progettocloud.herokuapp.com request_id = 09591202-8bee-4680-8dc9-98c2422a2b6d fwd =“151.18.21.88”dyno = connect = service = status = 503 bytes =