cannot log in into admin

[editor123]

i get this awful error when i try to log into my admin after a server migartion. the rest of the forum works fine

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in [path]/includes/init.php on line 275

Unable to add cookies, header already sent.
File: /home/forosdeh/public_html/includes/class_core.php
Line: 3254

[mindhunter77]

make sure there is no white space below the ending ?> in the class_core.php file. That's the first thing that comes to mind.