I have received the same error message, "PHP Fatal error: Call to undefined function: () in /home/public_html/generator/pages/mods/mobile.inc.php(2) : eval()'d code on line 41". However, when I run the sitemap generator manually, I do not get this error, and the sitemaps generate perfectly. I only get this error when I run the sitemap generator through the cron. Other than this, I have no othe problems with the generator. Is there something else I can do other than disabling the mobile sitemap option? Of course the other obvious alternative is to run the generator manually, but I would prefer the issue be fixed, not ignored.