ok I've been getting various errors ever since trying to move to a different server.

Anyone know what this one might mean?

[06-Nov-2009 17:29:05] PHP Fatal error: Cannot call overloaded function for non-object in /usr/local/pem/vhosts/118405/webspace/httpdocs/includes/functions/functions_lookups.php on line 1799


I've tried replacing functions_lookups.php and it makes no difference

line 1799 is

Code:
 $upcoming_mask = date('Ymd', $upcoming_mask_range);
My page only partially loads. It seems to work ok if I turn off ch_categories.php

Also I notice the new server is using MySQL 4.1.22 whereas the old one was using MySQL 5.0.81

might that make a difference when moving the database?