Neither BindingResult nor plain target object for bean name 'reservationBinding' available as request attribute - spring

Question

I started to work with thymeleaf in a basic project. When I try to put th:field="*{name}" in form, comes error with thymeleaf parsing. Only with th:object="${reservationBinding}" without any th:fields works correctly. I can't understand why doesn't work with th:filed.
Here is my controller where I set the message:
#Controller
public class ReservationController {
#GetMapping("/reservation")
public String checkFOrReservationGet(Model model){
model.addAttribute ("reservationBinding",new ReservationBinding ());
return "index";
}
#PostMapping("/reservation")
public String checkForReservation(#Valid #ModelAttribute() ReservationBinding reservationBinding,
Model model,
BindingResult bindingResult,
RedirectAttributes redirectAttributes,
HttpSession httpSession){
// model.addAttribute ("reservationBinding",new ReservationBinding ());
if(bindingResult.hasErrors ()){
redirectAttributes.addFlashAttribute ("reservationBinding",reservationBinding);
redirectAttributes.addFlashAttribute ("org.springframework.validation.BindingResult.reservationBinding",bindingResult);
return "redirect:#book-a-table";
}
return "redirect:#book-a-table";
}
Here is my html form
<form action="#book-a-table" th:action="#{/reservation}" method="post" th:object="${reservationBinding}" >
<div class="row">
<div class="col-lg-4 col-md-6 form-group" >
<input type="text" name="name" class="form-control" id="name"
placeholder="name" data-rule="minlen:4"
th:field="*{name}"
data-msg="Please enter at least 4 chars">
<div class="validate"></div>
</div>
<div class="col-lg-4 col-md-6 form-group mt-3 mt-md-0">
<input type="email" class="form-control" name="email" id="email" placeholder="Your Email" data-rule="email"
data-msg="Please enter a valid email">
<div class="validate"></div>
</div>
<div class="col-lg-4 col-md-6 form-group mt-3 mt-md-0">
<input type="text" class="form-control" name="phone" id="phone" placeholder="Your Phone" data-rule="minlen:4"
data-msg="Please enter at least 4 chars">
<div class="validate"></div>
</div>
<div class="col-lg-4 col-md-6 form-group mt-3">
<input type="text" name="date" class="form-control" id="date" placeholder="Date" data-rule="minlen:4"
data-msg="Please enter at least 4 chars">
<div class="validate"></div>
</div>
<div class="col-lg-4 col-md-6 form-group mt-3">
<input type="text" class="form-control" name="time" id="time" placeholder="Time" data-rule="minlen:4"
data-msg="Please enter at least 4 chars">
<div class="validate"></div>
</div>
<div class="col-lg-4 col-md-6 form-group mt-3">
<input type="number" class="form-control" name="people" id="people" placeholder="# of people"
data-rule="minlen:1" data-msg="Please enter at least 1 chars">
<div class="validate"></div>
</div>
</div>
<div class="form-group mt-3">
<textarea class="form-control" name="message" rows="5"
placeholder="Message"></textarea>
<div class="validate"></div>
</div>
<div class="mb-3">
<div class="loading">Loading</div>
<div class="error-message"></div>
<div class="sent-message">Your booking request was sent. We will call back or send an Email to confirm your reservation. Thank you!</div>
</div>
<div class="text-center"><button type="submit" >Send Message</button></div>
</form>
This is my bindingModel
public class ReservationBinding {
private String name;
private String email;
private String phone;
private String date;
private String time;
private int People;
private String message;
public ReservationBinding(){
}
// #Length(min = 2, message = "Username length must be minimum two characters!.")
public String getName(){
return name;
}
public ReservationBinding setName(String name){
this.name = name;
return this;
}
#Column(name = "email", nullable = false)
#Email(message = "Enter valid email address.")
public String getEmail(){
return email;
}
public ReservationBinding setEmail(String email){
this.email = email;
return this;
}
#Column(name = "phone", nullable = false)
#Length(min = 9, message = "Enter valid phone number.")
public String getPhone(){
return phone;
}
public ReservationBinding setPhone(String phone){
this.phone = phone;
return this;
}
#Column(name = "date", nullable = false)
public String getDate(){
return date;
}
public ReservationBinding setDate(String date){
this.date = date;
return this;
}
#Column(name = "time")
#Length(min = 2, message = "Enter a valid time for check in.")
public String getTime(){
return time;
}
public ReservationBinding setTime(String time){
this.time = time;
return this;
}
#Min(value = 2, message = "What is the number of the guests")
public int getPeople(){
return People;
}
public ReservationBinding setPeople(int people){
People = people;
return this;
}
public String getMessage(){
return message;
}
public ReservationBinding setMessage(String message){
this.message = message;
return this;
}
}
Do you have any idea, why alone th:object map the properties and when I put th:field doesn't work and comes
org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing
(template: "class path resource [templates/index.html]"
Error during execution of processor
'org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor'
(template: "index" - line 564, col 17)