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I built a Chinese language package in frontend>messages, why can’t it be used in the form model in frontend>model? 'id'=> Yii::t('common','ID'), says Yii is an undefined class? Please God, what is going on?

This is the code for the language pack:

return [
    'Blog'=>'博客',
    'Article'=>'文章',
    'Signup'=>'注冊',
    'Login'=>'登錄',
    'Email' => '郵箱',
    'artTitle'=> '文章標題',
];

This is the calling code:

public function attributeLabels()
    {
        return [
            //'id'=> Yii::t('common','ID'),
            //'id' => '編碼',
            //'title' => '標題',
            'title' => yii::t('common','artTitle'),
            'content' => '內(nèi)容',
            'label_img' =>'標簽圖',
            'tags' => '標簽',
            'cat_id'=>'分類'
        ];
    }

yii said it is an undefined class~
Please give me some guidance on how to modify it