I have already done that.
I have backed up and gone back to the older version. I have tried it again, and it repeats it. I have done auto updates and manual updates. I have overwritten just functions.php and overwritten the whole thing (minus content and config). I have also deleted the folders and reuploaded all the files.
I just need a solution, as I said… I have a backup and I have gone back. I am attempting to upgrade again.