yii2应用程序以错误开始

我在启动Yii2应用程序时遇到了一个奇怪的错误！这件事需要你的帮助。以下是我得到的信息：

     PHP Warning – yii\base\ErrorException

mb_strlen（）要求参数1为字符串，数组给定

1. in /var/www/yii2/basic/vendor/yiisoft/yii2/helpers/BaseStringHelper.php at line 31
22232425262728293031323334353637383940

{
    /**
     * Returns the number of bytes in the given string.
     * This method ensures the string is treated as a byte array by using `mb_strlen()`.
     * @param string $string the string being measured for length
     * @return integer the number of bytes in the given string.
     */
    public static function byteLength($string)
    {
        return mb_strlen($string, '8bit');
    }

    /**
     * Returns the portion of string specified by the start and length parameters.
     * This method ensures the string is treated as a byte array by using `mb_substr()`.
     * @param string $string the input string. Must be one character or longer.
     * @param integer $start the starting position
     * @param integer $length the desired portion length. If not specified or `null`, there will be
     * no limit on length i.e. the output will be until the end of the strin

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我在复制项目中的外部组件时出现了相同的错误消息。在我的情况下，我通过运行

   composer update

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如果你觉得有用的话，你可以在每个答案上使用upvote，我愿意，但是投票需要15个声望。这是我的第一篇帖子。谢谢你的回复，我希望你能在短时间内成为一名优秀的Yii2st，干得好