I have a problem with the XML-Sitemaps Generator.

I don't know, how i cant solve this:

Links depth: 4
Current page: shopping_cart.php/cat/c7003150
Pages added to sitemap: 54157
Pages scanned: 54980 (21,029,531.4 KB)
Pages left: 4922 (+ 69949 queued for the next depth level)
Time passed: 12:54:16
Time left: 1:09:18
Memory usage: 120,141.5 Kb
Resuming the last session (last updated: 2009-06-28 11:51:46)
Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 30773689 bytes) in /srv/www/server4supplies.com/store_files/60/export/site/gen/pages/class.utils.inc.php(2) : eval()'d code on line 27

What can i do (change the Configuration?)

Greetz Torben