我正面临Heroku部署错误。当我在Heroku上部署rails 5应用程序时，会发生以下错误：
“应用程序中发生错误，您的页面无法执行 提供服务。如果您是应用程序所有者，请检查您的日志 方式”。
我的Heroku app日志就是这个
2018-01-11T11:31:08.702143+00:00 heroku[web.1]: State changed from starting to crashed
2018-01-11T11:31:08.687436+00:00 heroku[web.1]: Process exited with status 1
2018-01-11T11:31:56.372775+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/robots.txt" host=concept-car-dealer.herokuapp.com request_id=61c90fd0-3588-4f34-b463-45cc6c37e73e fwd="103.255.6.80" dyno= connect= service= status=503 bytes= protocol=https
2018-01-11T11:31:57.235468+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/robots.txt" host=concept-car-dealer.herokuapp.com request_id=0edb9bee-a765-4500-98b2-09b0826082c9 fwd="103.255.6.80" dyno= connect= service= status=503 bytes= protocol=https
2018-01-11T11:31:56.859412+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=concept-car-dealer.herokuapp.com request_id=b72c7768-541c-42db-b7f1-6f02a853fef2 fwd="103.255.6.80" dyno= connect= service= status=503 bytes= protocol=https
2018-01-11T11:31:55.750150+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/robots.txt" host=concept-car-dealer.herokuapp.com request_id=780a212f-5fa1-4143-9b26-d245acb50444 fwd="103.255.6.80" dyno= connect= service= status=503 bytes= protocol=https
Here is the link of my Heroku App 。 And here is the link of my GitHub repo