Have created a new sub domain site – this is the error message when I try to login to that site
Warning: Cannot modify header information – headers already sent by (output started at /home4/ionscorp/public_html/wp-admin/includes/plugin.php:1941) in /home4/ionscorp/public_html/wp-includes/pluggable.php on line 1228
I have been running multi site for a long time and had set up the wild card subdomain years ago but now trying to set up domain mapping. Are there more settings I need to change?