can't create new user+mysql error

[sergio]

Hi,
can you help me?
When I want to create a new user I get the message :"While executing query "INSERT INTO cpg143_users(user_regdate, user_active) VALUES (NOW(), 'YES')" on 0

mySQL error: Duplicate entry '' for key 2"

and

"file: /srv/www/htdocs/web116/html/coppermine/include/functions.inc.php - : 248"

What is wrong?

How can I solve the problem with phpMyAdmin tool?

thanx

Sergio

[Joachim Müller]

http://forum.coppermine-gallery.net/index.php?action=search2;search=Duplicate%20entry