Links depth: -
Current page: -
Pages added to sitemap: -
Pages scanned: - (- KB)
Pages left: - (+ - queued for the next depth level)
Time passed: -
Time left: -
Memory usage: -
============================================================ 2012-11-05 06:34:02 Resuming the last session (last updated: 2012-11-05 06:18:54)

Crawling completed
Total pages indexed: 56232
Creating sitemaps... and calculating changelog...

Fatal error: Allowed memory size of 251658240 bytes exhausted (tried to allocate 1310676 bytes) in /home/wsisws/public_html/ on line 387

How to fix this?

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.