Error When Configuring Portal

[Seagoat]

I'm receiving this error when I try to save changes I've made in my Portal settings:

Warning: Invalid argument supplied for foreach() in /home/eq2inter/public_html/portal_admin.php on line 144

Warning: Cannot modify header information - headers already sent by (output started at /home/eq2inter/public_html/forums/includes/class_core.php:3036) in /includes/functions.php on line 2676

The changes seem to stick, but the "thank you" or "success" or "next step" page after I click the button isn't displaying.


PS - I should add that this was during my initial portal setup, on the settings page I was taken to immediately after enabling my author portal. Subsequent visits and changes to the settings page don't seem to generate this error.