Good day,

Could somebody please explain why log files named myDEBUG-999999-999999.log keep accumulating in my cache folder? Their content is:

[17-Jun-2011 18:16:21] PHP Fatal error: Call to a member function buildTree() on a non-object in /home3/MYUSER_ID/public_html/includes/templates/MY_TEMPLATE/templates/tpl_page_not_found_default.php on line 27

(bolded blue characters masking real names)
Line 27 referred in the error message is:

Code:
<div><?php echo $zen_SiteMapTree->buildTree(); ?>
My Zen Cart version is 1.3.9h and the URL is Athens Collectibles if that helps.

Any assistance will be much appreciated. Many thanks in advance.