Generator stops and freezes

[paypal1424]

I have been trying to create a sitemap with Unlimited Sitemap Generator for a couple of days without success. After indexing ~1450 pages, the process freezes.
I've tried all the recommendations that I found in the forums, but no luck.
See the attached.
The site is a large dynamic site with pages being created on demand.
Any Suggestions?
--bob

[XML-Sitemaps Support]

Hello,

it looks like your server configuration doesn't allow to run the script long enough to create full sitemap. Please try to increase memory_limit and max_execution_time settings in php configuration at your host (php.ini file) or contact hosting support regarding this.