Need help

When activating users that have registered through my site, i got the following errors.

An error has occurred while interacting with the database.

The exact nature of database errors is not captured unless Gallery debug mode is enabled in config.php. Before seeking support for this error please enable buffered debug output and retry the operation. Look near the bottom of the lengthy debug output to find error details.
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Error Detail -
Error (ERROR_STORAGE_FAILURE)
in modules/core/classes/GalleryStorage/GalleryStorageExtras.class at line 1113 (GalleryCoreApi::error)
in modules/core/classes/GalleryStorage.class at line 533 (GalleryStorageExtras::removeMapEntry)
in modules/core/classes/GalleryCoreApi.class at line 2935 (GalleryStorage::removeMapEntry)
in modules/notification/classes/NotificationItemStateChangeHandler.class at line 63 (GalleryCoreApi::removeMapEntry)
in modules/core/classes/helpers/GalleryEventHelper_simple.class at line 59 (NotificationItemStateChangeHandler::handleEvent)
in modules/core/classes/GalleryCoreApi.class at line 2238 (GalleryEventHelper_simple::postEvent)
in modules/core/classes/GalleryEntity.class at line 365 (GalleryCoreApi::postEvent)
in modules/register/classes/GalleryPendingUserHelper.class at line 377 (GalleryEntity::delete)
in modules/register/AdminSelfRegistration.inc at line 67 (GalleryPendingUserHelper::createGalleryUser)
in main.php at line 250 (AdminSelfRegistrationController::handleRequest)
in main.php at line 104
in main.php at line 88
System Information
Gallery version 2.3
PHP version 5.2.6-3ubuntu4.1 apache2handler
Webserver Apache/2.2.11 (Ubuntu) PHP/5.2.6-3ubuntu4.1 with Suhosin-Patch
Database mysqlt 5.0.75-0ubuntu10.2
Toolkits Thumbnail, Gd
Operating system Linux sourire 2.6.28-13-generic #45-Ubuntu SMP Tue Jun 30 19:49:51 UTC 2009 i686
Browser Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/532.0 (KHTML, like Gecko) Chrome/3.0.195.27 Safari/532.0