Yii2:无法将模型保存为其生成的\uuu csrf令牌

控制器：

public function actionWriteus()
    {
        $model = new ContactUs();
        if ($model->load(Yii::$app->request->post())) {

            $model->save();
            return $this->redirect('confirmation');
        } else {
            return $this->render('writeus', [
                'model' => $model,
            ]);
        }
    }

型号：

<?php

    namespace backend\models;

    use Yii;

    class ContactUs extends \yii\db\ActiveRecord
    {
        /**
         * @inheritdoc
         */
        public static function tableName()
        {
            return 'contact_us';
        }

        /**
         * @inheritdoc
         */
        public function rules()
        {
            return [
                [['phone'], 'integer'],
                [['message'], 'string'],
                [['verifyCode'], 'required'],
                [['first_name', 'last_name', 'email', 'verifyCode'], 'string', 'max' => 50],
                [['city', 'country'], 'string', 'max' => 20],
            ];
        }


    }

我需要像正常模式保存一样提交此表单，但无法提交此表单。是什么导致了这个问题

视图：

视图：

写信给我们
名字
姓
城市
国家
电子邮件
电话
消息
验证码
创造

请删除

<form id="write_us" class="form">

---

从view.Yii2框架将自动生成表单元素html。

请显示您的相关视图代码。.无论如何，我已经发布了我的第一个建议。.显示您的完整控制器代码。使用的控制器名称空间是什么，以及您如何访问ContactUs（提及ContactUs的名称空间）在controller.updated问题中，请在表单提交之前向我显示您呈现的html代码，谢谢！！！

<?php $form = ActiveForm::begin(); ?>

    <?= $form->field($model, 'first_name')->textInput(['maxlength' => true]) ?>

    <?= $form->field($model, 'last_name')->textInput(['maxlength' => true]) ?>

    <?= $form->field($model, 'city')->textInput(['maxlength' => true]) ?>

    <?= $form->field($model, 'country')->textInput(['maxlength' => true]) ?>

    <?= $form->field($model, 'email')->textInput(['maxlength' => true]) ?>

    <?= $form->field($model, 'phone')->textInput() ?>

    <?= $form->field($model, 'message')->textarea(['rows' => 6]) ?>

    <?= $form->field($model, 'verifyCode')->textInput(['maxlength' => true]) ?>

    <div class="form-group">
        <?= Html::submitButton($model->isNewRecord ? 'Create' : 'Update', ['class' => $model->isNewRecord ? 'btn btn-success' : 'btn btn-primary']) ?>
    </div>

    <?php ActiveForm::end(); ?>

            <!-- Write Us -->
            <div class="col-md-6 bordered_block image_bck grey_border" data-color="#fff">
                <div class="over" data-opacity="0.02" data-color="#121d2a"></div>
                <div class="col-md-12 simple_block text-left">
                    <h3>Write Us</h3>
                    <form id="write_us" class="form">
                        <form id="w0" action="/NewHotel/advanced/frontend/web/index.php?r=site%2Fwriteus" method="post">
<input type="hidden" name="_csrf" value="N19ISUwxWnRnZxFkO15jDlNmA3F/fm9ZQBUMOyV4Oz9HFA4OeFcYMQ==">
    <div class="form-group field-contactus-first_name">
<label class="control-label" for="contactus-first_name">First Name</label>
<input type="text" id="contactus-first_name" class="form-control" name="ContactUs[first_name]" maxlength="50">

<div class="help-block"></div>
</div>
    <div class="form-group field-contactus-last_name">
<label class="control-label" for="contactus-last_name">Last Name</label>
<input type="text" id="contactus-last_name" class="form-control" name="ContactUs[last_name]" maxlength="50">

<div class="help-block"></div>
</div>
    <div class="form-group field-contactus-city">
<label class="control-label" for="contactus-city">City</label>
<input type="text" id="contactus-city" class="form-control" name="ContactUs[city]" maxlength="20">

<div class="help-block"></div>
</div>
    <div class="form-group field-contactus-country">
<label class="control-label" for="contactus-country">Country</label>
<input type="text" id="contactus-country" class="form-control" name="ContactUs[country]" maxlength="20">

<div class="help-block"></div>
</div>
    <div class="form-group field-contactus-email">
<label class="control-label" for="contactus-email">Email</label>
<input type="text" id="contactus-email" class="form-control" name="ContactUs[email]" maxlength="50">

<div class="help-block"></div>
</div>
    <div class="form-group field-contactus-phone">
<label class="control-label" for="contactus-phone">Phone</label>
<input type="text" id="contactus-phone" class="form-control" name="ContactUs[phone]">

<div class="help-block"></div>
</div>
    <div class="form-group field-contactus-message">
<label class="control-label" for="contactus-message">Message</label>
<textarea id="contactus-message" class="form-control" name="ContactUs[message]" rows="6"></textarea>

<div class="help-block"></div>
</div>
    <div class="form-group field-contactus-verifycode required">
<label class="control-label" for="contactus-verifycode">Verify Code</label>
<input type="text" id="contactus-verifycode" class="form-control" name="ContactUs[verifyCode]" maxlength="50">

<div class="help-block"></div>
</div>
    <div class="form-group">
        <button type="submit" class="btn btn-success">Create</button>    </div>

    </form>                    </div>
                </div>
                <!-- Write Us End -->
            </div>
            <!-- Row End -->
        </div>
    </section>
    <!-- Contacts End -->

<form id="write_us" class="form">