I purchased Divi Ultimate Child Theme in 2018 for one year. Still using it, including version 4 of the Ultimate Header that is part of the child theme. As of today I am getting this error when trying to log into admin page: Warning: Cannot modify header information - headers already sent by (output started at /home/rebell91/public_html/wp-content/themes/Divi-Ultimate/functions.php:258) in /home/rebell91/public_html/wp-includes/pluggable.php on line 1265 I have made zero changes to my site. All plugins are current. When I disable Divi Ultimate, I can then log in. Will replacing the header plugin with the latest version solve this? Can I purchase the Ultimate Header plugin separately and combine it with my legacy Ultimate Child Theme?