Setting unknown property: yii\validators\FileValidator::0?

Question

Yii

Good evening, I'm trying to add news from the site through the admin panel, I click on "Add" and then this flies out:

Here are the rules:

public function rules()
    {
        return [
            [['name', 'body', 'alt', 'img_small', 'img_big', 'put_date', 'hide'], 'required'],
            [['body', 'alt', 'img_small', 'img_big', 'hide'], 'string'],
            [['img_name'], 'default', 'value' => 0],
            [['put_date'], 'safe'],
            [['name'], 'string', 'max' => 255],
            [['image'], 'file', 'skipOnEmpty' => false, 'extensions' => 'png', 'jpg'],
        ];
    }

And here is the table:

Answer 1

'extensions' => 'png', 'jpg'],
change
to
'extensions' => ['png', 'jpg']],