[rt-users] Problems adding a user in RT 3.0.2

[Lieven]

Hello,
Is there somebody who can help me in adding a user decently, without 
getting the following error that seems to appear for every attempt to add a 
new user:


error:  RT::User::crit Unimplemented in RT::User. 
(/opt/rt3/lib/RT/User_Overlay.pm line 296)
context:
...
277:  }
278:
279:  # All errors returned from this routine will be in exception form.
280:  local $SIG{'__DIE__'} = sub {
281:  rethrow_exception( $_[0] );
282:  };
283:
284:  #
285:  # $m is a dynamically scoped global containing this
...
code stack:  /usr/lib/perl5/site_perl/5.8.0/HTML/Mason/Request.pm:281
/usr/lib/perl5/site_perl/5.8.0/DBIx/SearchBuilder/Record.pm:458
/opt/rt3/lib/RT/User_Overlay.pm:296
/opt/rt3/share/html/Admin/Users/Modify.html:219
/opt/rt3/share/html/autohandler:158


If I try to add the same user again, I obtain a complaint stating that the 
user already exists. Effectively, under MySQL, the user appears in table 
'users' from the rt3 database.
The error appears for every user that I try to add.
Thank you for your help!

Lieven