提交时候出现的错误

来源：8-2 商品添加操作（图片使用七牛上传)

慕码人4209688

2018-10-28

Wrong parameters for Exception([string $message [, long $code [, Throwable $previous = NULL]]])

28293031323334353637383940 $cate = new Category;
$list = $c a t e - > g e t O p t i o n s (); u n s e t ($ list[0]);

    if (Yii::$app->request->isPost) {
        $post = Yii::$app->request->post();
        $pics = $this->upload();
        if (!$pics) {
            $model->addError('cover', '封面不得为空');
        } else {
            $post['Product']['cover'] = $pics['cover'];
            $post['Product']['pics'] = $pics['pics'];
        }
            
            这是哪一步出的问题呢

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