Please upgrade to 2.3 here.
The 2.2 and earlier branches are no longer being updated.
Theme Problems with All Categories Front Page
This discussion is related to the Rounder
Since the 2.0.17 update, I attempted to set the front page as the All Category page. When I try to navigate to it, I get an error of:
Fatal error: Call to a member function NumRows() on a non-object in [my forum folder]/themes/rounder/vanilla/views/categories/all.php on line 8