Errors while logged into other ADMIN usernames

[Mrdby]

This appears at the top

Warning: Cannot use a scalar value as an array in [path]/global.php(612) : eval()'d code on line 1563

and when I try to log into my CP it shows me

Unable to add cookies, header already sent.
File: /****/local/home/*****/****.net/forum/includes/class_core.php
Line: 3243

anybody?

[Lynne]

Have you tried disabling your plugins to see if the error still occurs?

[Mrdby]

it stopped... so now I have to figure out what is what.