user warning: Duplicate entry

ciao a tutti,
non riesco a capire che tipo di problema sia: ovvero ogni tanto quando aggiorno o modifico qualcosa a qualunque livello mi escono una serie di warning. ve ne posto uno:

Quote:

user warning: Duplicate entry 'themes/zubrick/zubrick.info' for key 1 query: INSERT INTO dr_system (name, owner, info, type, filename, status, throttle, bootstrap) VALUES ('zubrick', 'themes/engines/phptemplate/phptemplate.engine', 'a:13:{s:4:"name";s:7:"Zubrick";s:11:"description";s:25:"Simple super nice scheme.";s:7:"version";s:7:"6.x-1.1";s:4:"core";s:3:"6.x";s:6:"engine";s:11:"phptemplate";s:7:"project";s:7:"zubrick";s:9:"datestamp";s:10:"1213013128";s:7:"regions";a:5:{s:4:"left";s:12:"Left sidebar";s:5:"right";s:13:"Right sidebar";s:7:"content";s:7:"Content";s:6:"header";s:6:"Header";s:6:"footer";s:6:"Footer";}s:8:"features";a:10:{i:0;s:20:"comment_user_picture";i:1;s:7:"favicon";i:2;s:7:"mission";i:3;s:4:"logo";i:4;s:4:"name";i:5;s:17:"node_user_picture";i:6;s:6:"search";i:7;s:6:"slogan";i:8;s:13:"primary_links";i:9;s:15:"secondary_links";}s:11:"stylesheets";a:1:{s:3:"all";a:1:{s:9:"style.css";s:24:"themes/zubrick/style.css";}}s:7:"scripts";a:1:{s:9:"script.js";s:24:"themes/zubrick/script.js";}s:10:"screenshot";s:29:"themes/zubrick/screenshot.png";s:3:"php";s:5:"4.3.5";}', 'theme', 'themes/zubrick/zubrick.info', 0, 0, 0) in /web/htdocs/www.oratoriodiferno.it/home/drupal/modules/system/system.module on line 830.

di cosa si tratta?