Forum Help!
 

For some odd reason whenever I try to do anything on my site I get:

Warning: mysql_query() [function.mysql-query]: Unable to save result set in [path]/includes/class_core.php on line 413

Warning: Cannot modify header information - headers already sent by (output started at [path]/includes/class_core.php:4551) in [path]/includes/functions.php on line 3808

This popped up after I went into the admin cp and made a change to the registered members usergroup.

Any ideas?