Ajax调用后提交表单

I have a JSP page and I want to work just on the main content of the page, so when I click on some item of menu, it refreshes the main content of the page.

My main page:

<a onclick="formAjax()">Cartes objet de recours</a> 
<div id="page_gestion"></div>

My ajax call:

function formAjax() {
$.ajax({
    url : 'form1',
    success : function(responce) {   
            $('#page_gestion').html(responce);
        }
});
}

My controller:

@RequestMapping(value="/form1") 
public String form1(Map<String, Object> model, HttpServletRequest request,
                    HttpServletResponse responce, ModelMap modelmap) {  
    model.put("lostcard", new Lostcard());
    return "form/form1" ;
}

My JSP page, if we can say so, that loads the main content of the main page:

<%@taglib prefix="form" uri="http://www.springframework.org/tags/form"%>

<form:form method="POST" modelAttribute="lostcard" action="enregistrerLostCard"
           id="formCard_Lost">
  [...]
</form:form>    

At this point everything is ok, but when I submit my form I get this error:

java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'lostcard' available as request attribute