编辑函数后出错。php

我正在对functions.php文件进行较小的更改,但是当我进行更改时遇到错误,我使用了FileZilla并撤消了我添加的功能,但现在我收到以下错误消息,

致命错误:调用未定义函数add_action() /home/content/93/7877293/html/wordpress/wp-includes/functions.php on 第51行

我确定该文件现在处于原始状态.有人可以通过建议我如何处理来帮助我吗?

谢谢.

I was making minor changes to functions.php file but just as I made the changes I got an error, I used FileZilla and undo the function I added but now I am getting the following error,

Fatal error: Call to undefined function add_action() in /home/content/93/7877293/html/wordpress/wp-includes/functions.php on line 51

I am sure that the file is now in its original condition. Can anyone help me by suggesting me how to deal with it?

Thanks in advance.