Error create Sitemap

I try to create sitemap for www.community4business.com , i get the following errors

Warning: opendir(/home/communi5/public_html/cache_public/) [function.opendir]: failed to open dir: No such file or directory in /home/communi5/public_html/inc/classes/BxDolSiteMaps.php on line 141

Warning: Cannot modify header information - headers already sent by (output started at /home/communi5/public_html/inc/classes/BxDolSiteMaps.php:141) in /home/communi5/public_html/inc/admin_design.inc.php on line 48

Make sure that the directory /home/communi5/public_html/cache_public/ exists and writable.

Also you can check folders permissions in admin panel > tools > host tools > permissions