Why doesn't compare work?

Question

Yii

validation rules in the model:

public function rules()
    {
        return [
            ['password_compare', 'compare', 'compareAttribute'=>'password', 'message'=>"Пароли не совпадают"],
        ];
    }

the form:

<div class="content_add-center-item">
    <div class="content_add-center-item-title">
        Новый пароль:
    </div>
     <div class="content_add-center-item-field">
            <?= $form->field($model, 'password')->textInput() ?>
     </div>
</div>
<div class="content_add-center-item">
     <div class="content_add-center-item-title">
            Повторите новый пароль:
     </div>
     <div class="content_add-center-item-field">
            <?= $form->field($model, 'password_compare')->textInput() ?>
      </div>
</div>

Finally,

what am I doing wrong?