Please dont register or do anything on the RPG right now since it is being updated and there are some problems... your character will most likely be deleted if you create one now.
well i am talking to corey about that later, its really a pain even for me ... i dont like having to donate to myself to get my wasted points back so i think it should be free... we'll see...
What that error means is that includes/class_rpg_core isn't being included in global_start like it should.
open showthread_post_start.php and put at the top after the <?php
include(DIR . '/includes/class_rpg_core.php');
ad see if this helps.