在ActiveField中使用listBox时，不显示验证错误消息

Question

我有一段以下代码：

form->field($website, 'clients_id', [
          'template' => "{label}<div class='col-md-9'>{input}</div>\n{hint}\n{error}"
        ])
        ->listBox($dataList, [
                'data-placeholder' =>'Choose one..', 
                'class'            => 'select-select2',
                'style'            => 'width: 100%',
                'id'               => 'example-select2' 
            ]) 
        ->label('Clients')

在网站模型中仍然会返回“clients_id”字段的错误验证。但是在视图中没有显示错误

虽然在开发工具中我仍然看到这个标签

<div class="help-block help-block-error "></div>

---更新---

在我的模型中：

public function rules()
{
    return [
        [['domain', 'clients_id', 'online_date'], 'required'],
        [['online_date', 'created_at', 'updated_at'], 'safe'],
        [['active', 'clients_id'], 'integer'],
        [['domain'], 'string', 'max' => 255]
    ];
}

当我打印错误验证时

array(1) {["clients_id"]=> array(1) {[0]=> string(27) "Clients ID cannot be blank." }}

- 视图中的ActiveForm设置---

<?php 
    $form = ActiveForm::begin([
        'id'      => 'web-form',
        'layout'  => 'horizontal',
        'options' => [
            'class'   => 'form-horizontal form-bordered',
            'enctype' => 'multipart/form-data'
        ],
        'fieldConfig' => [
            'horizontalCssClasses' => [
                'label' => 'col-md-3 control-label',
            ],
        ],
    ]); 
?>

由于