MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query: DELETE FROM `mw_objectcache` WHERE keyname='wikidb-mw_:messages:September'
Function: MediaWikiBagOStuff::_doquery
Error: 2006 MySQL server has gone away (wiki.monticello.org)
' in /home/domains/wiki.monticello.org/docs/mediawiki/includes/Database.php:708
Stack trace:
#0 /home/domains/wiki.monticello.org/docs/mediawiki/includes/Database.php(665): Database->reportQueryError('MySQL server ha...', 2006, 'DELETE FROM `mw...', 'MediaWikiBagOSt...', false)
#1 /home/domains/wiki.monticello.org/docs/mediawiki/includes/BagOStuff.php(396): Database->query('DELETE FROM `mw...', 'MediaWikiBagOSt...')
#2 /home/domains/wiki.monticello.org/docs/mediawiki/includes/BagOStuff.php(296): MediaWikiBagOStuff->_doquery('DELETE FROM `mw...')
#3 /home/domains/wiki.monticello.org/docs/mediawiki/includes/BagOStuff.php(278): SqlBagOStuff->_query('DELETE FROM $0 ...', 'wikidb-mw_:mess...')
#4 /home/domains/wiki.monticello.org/docs/mediawiki/includes/MessageCache.php(556): SqlBagOStuff->delete('wikidb-mw_:mess...')
#5 /home/domains/wiki.monticello.org/docs/mediawiki/includes/MessageCache.php(457): MessageCache->getMsgFromNamespace('September')
#6 /home/domains/wiki.monticello.org/docs/mediawiki/includes/GlobalFunctions.php(420): MessageCache->get('september', true, true)
#7 /home/domains/wiki.monticello.org/docs/mediawiki/includes/GlobalFunctions.php(379): wfMsgGetKey('september', true, true, true)
#8 /home/domains/wiki.monticello.org/docs/mediawiki/includes/GlobalFunctions.php(328): wfMsgReal('september', Array, true, true)
#9 /home/domains/wiki.monticello.org/docs/mediawiki/languages/Language.php(337): wfMsgForContent('september')
#10 /home/domains/wiki.monticello.org/docs/mediawiki/languages/Language.php(356): Language->getMessageFromDB('september')
#11 /home/domains/wiki.monticello.org/docs/mediawiki/languages/Language.php(512): Language->getMonthName('09')
#12 /home/domains/wiki.monticello.org/docs/mediawiki/languages/Language.php(704): Language->sprintfDate('j F Y', '20090921152143')
#13 /home/domains/wiki.monticello.org/docs/mediawiki/includes/Skin.php(1122): Language->date('20090921202143', true)
#14 /home/domains/wiki.monticello.org/docs/mediawiki/includes/SkinTemplate.php(364): Skin->lastModified()
#15 /home/domains/wiki.monticello.org/docs/mediawiki/includes/OutputPage.php(643): SkinTemplate->outputPage(Object(OutputPage))
#16 /home/domains/wiki.monticello.org/docs/mediawiki/includes/Wiki.php(282): OutputPage->output()
#17 /home/domains/wiki.monticello.org/docs/mediawiki/index.php(48): MediaWiki->finalCleanup(Array, Object(LoadBalancer), Object(OutputPage))
#18 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in fetchObject(): MySQL server has gone away (wiki.monticello.org)' in /home/domains/wiki.monticello.org/docs/mediawiki/includes/Database.php:825
Stack trace:
#0 /home/domains/wiki.monticello.org/docs/mediawiki/includes/Database.php(2088): Database->fetchObject(false)
#1 /home/domains/wiki.monticello.org/docs/mediawiki/includes/LinkBatch.php(90): ResultWrapper->fetchObject()
#2 /home/domains/wiki.monticello.org/docs/mediawiki/includes/LinkBatch.php(69): LinkBatch->executeInto(Object(LinkCache))
#3 /home/domains/wiki.monticello.org/docs/mediawiki/includes/Skin.php(202): LinkBatch->execute()
#4 /home/domains/wiki.monticello.org/docs/mediawiki/includes/Skin.php(181): Skin->preloadExistence()
#5 /home/domains/wiki.monticello.org/docs/mediawiki/includes/SkinTemplate.php(106): Skin->initPage(Object(OutputPage))
#6 /home/domains/wiki.monticello.org/docs/mediawiki/skins/kindofblue.php(30): SkinTemplate->initPage(Object(OutputPage))
#7 /home/domains/wiki.monticello.org/docs/mediawiki/includes/SkinTemplate.php(153): Skinkindofblue->initPage(Object(OutputPage))
#8 /home/domains/wiki.monticello.org/docs/mediawiki/includes/OutputPage.php(643): SkinTemplate->outputPage(Object(OutputPage))
#9 /home/domains/wiki.monticello.org/docs/mediawiki/includes/Exception.php(74): OutputPage->output()
#10 /home/domains/wiki.monticello.org/docs/mediawiki/includes/Exception.php(95): MWException->reportHTML()
#11 /home/domains/wiki.monticello.org/docs/mediawiki/includes/Exception.php(171): MWException->report()
#12 /home/domains/wiki.monticello.org/docs/mediawiki/includes/Exception.php(205): wfReportException(Object(DBQueryError))
#13 [internal function]: wfExceptionHandler(Object(DBQueryError))
#14 {main}