Please help me with this error.

when i run crawling
Pages added to sitemap: 3069
Pages scanned: 12760 (726,297.5 KB)
Pages left: 39491 (+ 9771 queued for the next depth level)
Time passed: 0:32:36
Time left: 1:40:54
Memory usage: 66,384.7 Kb
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 17633059 bytes) in /var/www/

looks like you are running vBulletin forum on your site, make sure that you have selected corresponding urls exclusion preset in generator configuration.