Cron maintenance tasks

1. i don`t run cron manunually

run cron print massage

Fatal error: Call to undefined function xmlsitemap_flag_sitemap() in /home/content/A/t/a/Atanasoski/html/modules/xmlsitemap/xmlsitemap_user/xmlsitemap_user.module on line 37

..in status report

2.Cron maintenance tasks Last run 10 weeks 4 days ago
Cron has not run recently. For more information, see the online

3.Performance logging APC Disabled
Performance logging on live web sites works best if APC is enabled.
Performance logging APC memory size
APC has been configured for , which is less than the recommended 48 MB of memory. If you encounter errors when viewing the summary report, then try to increase that limit for APC.

any help,
tnx