@PasswordsMatch not working !

[Lucaadmin]

My code is:

<form id = "Formx" name = "Formx" class="rd-form rd-mailform" data-form-output="form-output-global" data-form-type="contact" method="get" action="index.php" data-constraints='@PasswordsMatch(field1="password1", field2="password2")'>



  <div class="col-md-6 wow-outer">
                        <div class="form-wrap wow fadeSlideInUp">
                          <label class="form-label-outside" for="password1">Password</label>
                          <input class="form-input" id="password1" type="password" name="password1" data-constraints="@Required">
                        </div>
                      </div>
					   <div class="col-md-6 wow-outer">
                        <div class="form-wrap wow fadeSlideInUp">
                          <label class="form-label-outside" for="password2">Ripeti Password</label>
                          <input class="form-input" id="password2" type="password" name="password2" data-constraints="@Required">
                        </div>
                      </div>


 <div class="wow-outer">
                        <button class="button button-primary button-winona wow slideInRight" type="submit">Invia</button>
                      </div>
</form>

what am I doing wrong ? thank you very much