error registering new user

Hmm... Everything was working fine for a long time but all of a sudden I'm getting an error when a new user tries to register. It appears to be permission related and I'm not sure what I might have done to cause it. I'm running this in a virtual wiki and have captured a debug log. It's huge, so I'm linking to it on my web server here: http://www.herkamur.ca/log.txt Any help would be most appreciated. -- "Any sufficiently advanced technology is indistinguishable from magic." -- Arthur C. Clarke -- Brian D. Switzer email: herkamur [at] canada [dot] com web: http://bswitzer.railfan.net/