hello-mvc 오류

# hello-template.html
<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<body>
<p th:text="'hello '+ ${name}">hello. empty</p>
</body>
</html>

package sebdev.prac1.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class HelloController {

    @GetMapping("hello")
    public String hello(Model model){
        model.addAttribute("data","spring");
        return "hello";
    }

    @GetMapping("hello-mvc")
    public String helloMvc(@RequestParam("name") String name, Model model){
        model.addAttribute("name", name);
        return "hello-template";
    }
}

리턴값 hello-template에 맞춰 hello-template.html으로 맞춰주었는데

이런식으로 오류가 납니다.