在模板解析过程中发生异常（spring boot thymeleaf与html文件的集成）

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HomeController.java

@Controller
public class HomeController {
    @RequestMapping("/")
    public String home(Model model) {
        model.addAttribute("formData", new User());
        return "index";
    }
}

index.html

<body>
    <p>Enter data below</p>

    <form action="/create" method="post" th:object="${formData}">
        <p>
            Full Name: <input type="text" th:field="${formData.fullName}" />
        </p>
        <p>
            Age: <input type="text" th:field="${formData.age}" />
        </p>
        <p>
            Employed: <input type="checkbox" th:field="${formData.employed}"
                th:value="true" />
        </p>
        <p>Choose Gender :</p>
        <p>
            Male <input type="radio" th:field="${formData.gender}"
                th:value="Male" /> Female <input type="radio"
                th:field="${formData.gender}" th:value="Female" />
        </p>
        <p>
            <input type="submit" value="Submit" /> <input type="reset"
                value="Reset" />
        </p>
    </form>
</body>

User.java

public class User {
    private String fullName;
    private int age;
    private boolean employed;
    private String gender;
    
    public User() {}
    
    public User(String fullName, int age, boolean employed, String gender) {
        super();
        this.fullName = fullName;
        this.age = age;
        this.employed = employed;
        this.gender = gender;
    }

    public String getFullName() {
        return fullName;
    }
    public void setFullName(String fullName) {
        this.fullName = fullName;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public boolean isEmployed() {
        return employed;
    }
    public void setEmployed(boolean employed) {
        this.employed = employed;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }   
}

这就是三个组件。我试图通过thymeleaf来绑定这个html。但是每次我都会得到错误的提示：

An error happened during template parsing (template: “class path resource [templates/index.html]”)

所有的getters和setters都是从源代码中生成的。如何将用户对象绑定到index html文件上？

StackOverflow：java - An error happened during template parsing (spring boot thymeleaf integration with html file) - Stack Overflow