[PsyK0]

Thanks all !
you must delete table 'rules' :

DELETE TABLE rules;

then re-create virgin table 'rules':

CREATE TABLE `rules` ( 
  `id` int(10) unsigned NOT NULL auto_increment, 
  `title` varchar(255) NOT NULL default '', 
  `text` text NOT NULL, 
  `usergroups` varchar(100) NOT NULL default '[0]', 
  PRIMARY KEY  (`id`) 
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=9;

After, go to staff panel > ModRules and create your rules...