v156 with Reward Points v2.5f

I've been updating my site from 155e to v156 and see that my points are being added and all apparently works as it should. But when I try to access admin/reward_points.php page which is under the catalog menu, I get the following error:

PHP Fatal error: require(): Failed opening required 'includes/modules/prod_cat_header_code.php'
But when I check my files, I have no such file since it seems to have been removed with this new udpate. I've also searched this thread for this and an Advanced search of the site... and can't find what I am looking for. Any ideas?