MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query: SELECT value,exptime FROM `wiki_objectcache` WHERE keyname='venturi:messages-hash'
Function: MediaWikiBagOStuff::_doquery
Error: 1044 Access denied for user: 'venturi@%' to database 'venturi' (sql10)
' in /home/venturi/www/w/includes/Database.php:647
Stack trace:
#0 /home/venturi/www/w/includes/Database.php(604): Database->reportQueryError('Access denied f...', 1044, 'SELECT value,ex...', 'MediaWikiBagOSt...', false)
#1 /home/venturi/www/w/includes/BagOStuff.php(380): Database->query('SELECT value,ex...', 'MediaWikiBagOSt...')
#2 /home/venturi/www/w/includes/BagOStuff.php(280): MediaWikiBagOStuff->_doquery('SELECT value,ex...')
#3 /home/venturi/www/w/includes/BagOStuff.php(227): SqlBagOStuff->_query('SELECT value,ex...', 'venturi:message...')
#4 /home/venturi/www/w/includes/MessageCache.php(186): SqlBagOStuff->get('venturi:message...')
#5 /home/venturi/www/w/includes/MessageCache.php(423): MessageCache->load()
#6 /home/venturi/www/w/includes/GlobalFunctions.php(450): MessageCache->get('mainpage', true, true)
#7 /home/venturi/www/w/includes/GlobalFunctions.php(409): wfMsgGetKey('mainpage', true, true, true)
#8 /home/venturi/www/w/includes/GlobalFunctions.php(358): wfMsgReal('mainpage', Array, true, true)
#9 /home/venturi/www/w/includes/Wiki.php(74): wfMsgForContent('mainpage')
#10 /home/venturi/www/w/index.php(105): MediaWiki->checkInitialQueries('', 'view', Object(OutputPage), Object(WebRequest), Object(LanguageFr))
#11 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in fetchObject(): Access denied for user: 'venturi@%' to database 'venturi'' in /home/venturi/www/w/includes/Database.php:764
Stack trace:
#0 /home/venturi/www/w/includes/MessageCache.php(302): Database->fetchObject(false)
#1 /home/venturi/www/w/includes/MessageCache.php(226): MessageCache->loadFromDB()
#2 /home/venturi/www/w/includes/MessageCache.php(423): MessageCache->load()
#3 /home/venturi/www/w/includes/GlobalFunctions.php(450): MessageCache->get('databaseerror', true, false)
#4 /home/venturi/www/w/includes/GlobalFunctions.php(409): wfMsgGetKey('databaseerror', true, false, true)
#5 /home/venturi/www/w/includes/Exception.php(17): wfMsgReal('databaseerror', Array)
#6 /home/venturi/www/w/includes/Database.php(209): MWException->msg('databaseerror', 'Database error')
#7 /home/venturi/www/w/includes/Exception.php(46): DBQueryError->getPageTitle()
#8 /home/venturi/www/w/includes/Exception.php(70): MWException->reportHTML()
#9 /home/venturi/www/w/includes/Exception.php(145): MWException->report()
#10 /home/venturi/www/w/includes/Exception.php(179): wfReportException(Object(DBQueryError))
#11 [internal function]: wfExceptionHandler(Object(DBQueryError))
#12 {main}