error message on registration page please HELP

[aj510]

I have an error for people who try to register more than one username(I think this is the only time this happens).

Anyways in the error log I get the following :

8: Undefined index: ID_THEME
File: /usr/home/tthongs/domains/modifiedcarforums.com/public_html/forums/Sources/Register.php
Line: 321

And the error message displayed is :

"An Error Has Occurred! You are not allowed to access this
section"

Doesn't really tell me a whole lot - are all error messages on simple machines this descriptive?

TIA,
AJ

[aj510]

bump for me - i am still getting this error and it would be lovely if someone could help me out with this.

cheers,
AJ