Fatal error

[Moderator note: Topic title de-capped. Please do not shout at us.]

Hi all,

About two weeks ago I was (very foolishly) playing around with the functions.php.

I updated it and it threw up a parse error. I instantly un-did the changes I had made, but there was still an error.

I entered via FTP access and deleted my functions.php file and re-uploaded the original from the theme template. Now I get this message.

Fatal error: Call to undefined function get_template_directory() in /nfs/c08/h04/mnt/123757/domains/terrehouse.com/html/wp-includes/functions.php on line 14

I don’t know what to do because it says there is an error in the functions.php folder but there can’t be because I have reverted it back to its original state.

-I have deleted all my plugins so it’s not that.
-Cache has been emptied on my browser.

Please please help. I am right at the end stage of my website and cannot afford to delete and start again.

THANKYOU!

website is

https://www.terrehouse.com/