Statistics page on MediaWiki displaying an error

apps

#1

http://wikademia.org/Special:Statistics

The link above displays the error:

A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was:
(SQL query hidden)
from within function “SiteStatsUpdate::cacheUpdate”. MySQL returned error “1054: Unknown column ‘ss_active_users’ in ‘field list’ (mysql.wikademia.org)”.

I’m not sure how to fix it, or why it is happening.

It does not display on:
http://selfindulgence.org/Special:Statistics

Wikademia