Problems with registering new user

I know this has already been covered in earlier discussion but I can't seem to get round the "An error occured during the registration process (-1)." for new users. I have read through the postings and the documentation but have had no joy. Is it because we are on the wiki farm? We are at http://ukeig.xwiki.com/ Karen -- Karen Blakeman, UKeiG Management Committee 88 Star Road, Caversham, Berks RG4 5BE, UK Tel: 0118 947 2256 Int. +44 118 947 2256 Mobile: 07764 936733 Int. +44 7764 936733 Fax: 020 8020 0253 Int. +44 20 8020 0253 Mailto:Karen.Blakeman@rba.co.uk http://www.rba.co.uk/