Yii 错误 400 尝试删除帖子时无法验证 CSRF 令牌

当我尝试删除帖子时，出现此错误:

When I was trying to delete a post I got this error:

Yii Error 400 The CSRF token could not be verified

我不知道究竟是什么导致了这种情况以及可能与什么有关.这是我的操作删除:

I don't know what is exactly causing this and to what it could be related. here is my action delete:

    public function actionDelete($id) {

         if (Yii::app()->request->isPostRequest) {
                // we only allow deletion via POST request
                $this->loadModel($id)->delete();

                // if AJAX request (triggered by deletion via admin grid view), we should not redirect the browser
                if (!isset($_GET['ajax']))
                $this->redirect(isset($_POST['returnUrl']) ? $_POST['returnUrl'] : array('admin'));
        }
        else
              throw new CHttpException(400, 'Invalid request. Please do not repeat this request again.');
    }

    protected function afterDelete()
    {
        parent::afterDelete();
        Image::model()->deleteAll('name='.$this->id);
        Date::model()->deleteAll('tbl_show_id='.$this->id);
        Press::model()->deleteAll('tbl_show_id='.$this->id);
    }