php Fatal error

Hi, I have a blog https://www.ericeirasurfservice.com using WordPress 3.2.1. with cosmicbuddy theme.
The blog are ready for social network and I already have a few blogs in sub-domains. All the post from this sub-domains are streaming to the main blog (domain) but I have an error “PHP Fatal error: Call to undefined function cb_activity_filter_links() in /var/www/vhosts/ericeirasurfservice.com/httpdocs/wp-content/themes/cosmicbuddy/members/single/activity.php on line 29”

I dont know what to do, I already post on buddydev forum but with no answers

I apology for posting here my question but I really need help