After validate ajax form not redirect to success or error result

[Josep M Serrainat]

Hi, I have a form with validations, server side,

<s:form id="cmxform" action="signin" namespace="/" method="post" cssClass="yform" >
  ...form fields
<div class="type-button">
							<sj:submit
								targets="result"
								button="true"
								validate="true"
								validateFunction="customeValidation"
								onBeforeTopics="removeErrors"
								onSuccessTopics="removeErrors"
								value="submit"
								indicator="indicator" />
								<img id="indicator" src="images/indicator.gif" alt="Loading..." style="display:none"/>
						</div>	
</s:form>

The action sigin is

@InterceptorRef("jsonValidationWorkflowStack")
@Validations(
	emails = {
			@EmailValidator(type = ValidatorType.SIMPLE, fieldName = "email", message = "Invalid e-mail address.")
	},
	requiredStrings = {
		@RequiredStringValidator(fieldName = "email", type = ValidatorType.FIELD, message = "Email is required"),
	    @RequiredStringValidator(fieldName = "firstName", type = ValidatorType.FIELD, message = "First name is required"),
	    @RequiredStringValidator(fieldName = "lastName", type = ValidatorType.FIELD, message = "Last name is required"),
	    @RequiredStringValidator(fieldName = "password", type = ValidatorType.FIELD, message = "Password is required"),
	    @RequiredStringValidator(fieldName = "confirmPassword", type = ValidatorType.FIELD, message = "Confirm password is required")
	},
	stringLengthFields = {
		@StringLengthFieldValidator(fieldName = "password", type = ValidatorType.SIMPLE, trim = true, minLength = "8" , message = "password must be equal or greater to eight characters")	
	},
	expressions = {
		@ExpressionValidator( expression = "password == confirmPassword", message = "Passwords are not equals")
	}
)
public class SigninAction extends BaseAction {

	@Action(value = "signin", results = {
			@Result(name = "success",  location = "inici.jsp"),
			@Result(name = "error", location = "activationFailed.jsp") })	
	public String execute(){
         ..... sign in user in db
               return SUCCESSS if go fine
               return ERROR if something goes wrong
        }

My problem is, when form is accepted the action not go to success or error results, displays the filled form

Thank for help me,..