I am having this same problem… did the fix as described — and i get the following error when i attempt to log in admin at https://countrysongsonline.com/wp-admin/
error here…
Warning: Cannot modify header information – headers already sent by (output started at /home/content/c/o/u/countrysongs/html/wp-config.php:3) in /home/content/c/o/u/countrysongs/html/wp-includes/pluggable.php on line 890
—– thats it and i cannot log on…
using godaddy hosting
