Boa tarde Guilherme, pode me mostrar suas classes de configuração?

package br.com.alura.listavip;

import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping;

@Controller public class ConvidadoController {

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

}

package br.com.alura.listavip;

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplicationpublic class Configuracao {

public static void main(String[] args) {
    SpringApplication.run(Configuracao.class, args);
}

}