I am having this same problem when i try to create pages.
i tried the patch -line 1413- on funtions.php but nothing.
I keep getting the following error, any idea? what can i do? : (
———my error——
Not Found
The requested URL /contact/ was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/1.3.36 Server at https://www.dominiosidn.com Port 80