Can't deploy to Heroku. at=error code=H10 desc="App crashed"

I'm trying to deploy my app to Heroku. And my app is crashed. This is errors:

at=error code=H10 desc="App crashed" method=GET path="/" 
host=smartmed2017.herokuapp.com request_id=3e8cc17e-320b-4230-bdbb-
3a751e3477de fwd="195.19.247.73" dyno= connect= service= status=503 
bytes= protocol=https

2017-06-01T11:17:42.380548+00:00 heroku[router]: at=error code=H10 
desc="App crashed" method=GET path="/favicon.ico" 
host=smartmed2017.herokuapp.com request_id=9ab6574e-3fed-4af3-9cae-
0651e13d9112 fwd="195.19.247.73" dyno= connect= service= status=503 
bytes= protocol=https

As usual, but I the reasons of this problem can be different.

This is Main.class

@Controller
@SpringBootApplication
public class Main
{
    public static void main(String[] args) throws Exception {
        SpringApplication.run(Main.class, args);
    }

    @RequestMapping("/")
    String index() {
        return "index";
    }
}

Procfile:

web: java -Dserver.port=$PORT -jar target/untitled-1.0-SNAPSHOT.jar

Screenshot of my classes and pages here