Please help!!

I have this problem.
There is error showing up on the jomsocial link :
Warning: call_user_func_array() []: First argument is expected to be a valid callback, 'CommunityModelActivities::getTotalActivities' was given in /home/hellohap/domains/ on line 1830

Please reply i am worried for this error and cannot find any solution. The jomsocial version is 2.xx

Is there an Omeka component to this?

Or did you mean to post this elsewhere?