My project was coming along rather swimmingly, but all of a sudden, the system won't allow new members to register. Furthermore, if I log in as an admin and attempt to add a user, I get the following error:
I've tried reinstalling the wiki (just by electing to upgrade it rather that completely reinstalling it) and this doesn't seem to help. Will I need to access my database to try to fix it? Will upgrading to Tiki 22 help (I currently use 21)?