Forum Cannot register new members on 4.0.3
 

Dear Forum, here is my issue. I would appreciate (as ever) some ideas on how to fix this problem as I cannot fix them myself as I lack your 1337 skills. :p

Background:
Forum functions on the web OK logged in as administrator.


Issue:
Trying to accept new members onto forum not possible - errror preventing user registration once all the details are filled in (user name, email address etc etc) and one presses the button to sign up.


Example of error:

Error produces white screen with black text at the URL:

http://www.mywebsite.com/forums/register.php?do=addmember

I get the message...........

Warning: require_once(includes/functions_vbsfs.php) [function.require-once]: failed to open stream: No such file or directory in [path]/register.php(327) : eval()'d code on line 3

Fatal error: require_once() [function.require]: Failed opening required 'includes/functions_vbsfs.php' (include_path='.:/usr/share/pear:/usr/share/php') in /websites/123reg/LinuxPackage21/xm/rv/po/mywebsite.com/public_html/forums/register.php(327) : eval()'d code on line 3


Attempted newbie investigations:

* Tried with Google Chrome, and IE8. Error is replicated.
* Allow new user registration ? Yes.
* Forum is active in admin CP also.

So I'm rather stuck as what is causing this issue.
Thank you in advance for any ideas.