MediaWiki internal error.

Original exception: [520fa98c] /swik/api.php?action=feedcontributions&user=Draconicus&feedformat=atom DBConnectionError from line 889 of /var/www/html/swik/includes/db/Database.php: DB connection error: No such file or directory (localhost)
Backtrace:
#0 /var/www/html/swik/includes/db/LoadBalancer.php(842): DatabaseBase->reportConnectionError(string)
#1 /var/www/html/swik/includes/db/LoadBalancer.php(537): LoadBalancer->reportConnectionError()
#2 /var/www/html/swik/includes/GlobalFunctions.php(3631): LoadBalancer->getConnection(integer, array, boolean)
#3 /var/www/html/swik/includes/cache/LocalisationCache.php(1157): wfGetDB(integer)
#4 /var/www/html/swik/includes/cache/LocalisationCache.php(404): LCStoreDB->get(string, string)
#5 /var/www/html/swik/includes/cache/LocalisationCache.php(450): LocalisationCache->isExpired(string)
#6 /var/www/html/swik/includes/cache/LocalisationCache.php(326): LocalisationCache->initLanguage(string)
#7 /var/www/html/swik/includes/cache/LocalisationCache.php(263): LocalisationCache->loadItem(string, string)
#8 /var/www/html/swik/languages/Language.php(3372): LocalisationCache->getItem(string, string)
#9 /var/www/html/swik/includes/specialpage/SpecialPageFactory.php(611): Language->getSpecialPageAliases()
#10 /var/www/html/swik/includes/specialpage/SpecialPage.php(69): SpecialPageFactory::getLocalNameFor(string, boolean)
#11 /var/www/html/swik/includes/api/ApiFormatBase.php(181): SpecialPage::getTitleFor(string)
#12 /var/www/html/swik/includes/api/ApiMain.php(1386): ApiFormatBase->closePrinter()
#13 /var/www/html/swik/includes/api/ApiMain.php(505): ApiMain->printResult(boolean)
#14 /var/www/html/swik/includes/api/ApiMain.php(436): ApiMain->handleException(DBConnectionError)
#15 /var/www/html/swik/includes/api/ApiMain.php(405): ApiMain->executeActionWithErrorHandling()
#16 /var/www/html/swik/api.php(88): ApiMain->execute()
#17 {main}

Exception caught inside exception handler: [d6628ef5] /swik/api.php?action=feedcontributions&user=Draconicus&feedformat=atom DBConnectionError from line 889 of /var/www/html/swik/includes/db/Database.php: DB connection error: No such file or directory (localhost)
Backtrace:
#0 /var/www/html/swik/includes/db/LoadBalancer.php(842): DatabaseBase->reportConnectionError(string)
#1 /var/www/html/swik/includes/db/LoadBalancer.php(537): LoadBalancer->reportConnectionError()
#2 /var/www/html/swik/includes/GlobalFunctions.php(3631): LoadBalancer->getConnection(integer, array, boolean)
#3 /var/www/html/swik/includes/cache/LocalisationCache.php(1157): wfGetDB(integer)
#4 /var/www/html/swik/includes/cache/LocalisationCache.php(349): LCStoreDB->get(string, string)
#5 /var/www/html/swik/includes/cache/LocalisationCache.php(263): LocalisationCache->loadItem(string, string)
#6 /var/www/html/swik/languages/Language.php(508): LocalisationCache->getItem(string, string)
#7 /var/www/html/swik/includes/search/SearchEngine.php(391): Language->getNamespaces()
#8 /var/www/html/swik/includes/User.php(1543): SearchEngine::searchableNamespaces()
#9 /var/www/html/swik/includes/User.php(5036): User::getDefaultOptions()
#10 /var/www/html/swik/includes/User.php(2616): User->loadOptions()
#11 /var/www/html/swik/includes/context/RequestContext.php(342): User->getOption(string)
#12 /var/www/html/swik/includes/StubObject.php(204): RequestContext->getLanguage()
#13 /var/www/html/swik/includes/StubObject.php(160): StubUserLang->_newObject()
#14 /var/www/html/swik/includes/StubObject.php(104): StubObject->_unstub(string, integer)
#15 /var/www/html/swik/includes/StubObject.php(179): StubObject->_call(string, array)
#16 /var/www/html/swik/includes/OutputPage.php(2092): StubUserLang->__call(string, array)
#17 /var/www/html/swik/includes/OutputPage.php(2092): StubUserLang->hasVariants()
#18 /var/www/html/swik/includes/OutputPage.php(2175): OutputPage->addAcceptLanguage()
#19 /var/www/html/swik/includes/GlobalFunctions.php(2147): OutputPage->sendCacheControl()
#20 /var/www/html/swik/includes/exception/MWException.php(237): wfHttpError(integer, string, string)
#21 /var/www/html/swik/includes/exception/MWExceptionHandler.php(69): MWException->report()
#22 /var/www/html/swik/includes/exception/MWExceptionHandler.php(180): MWExceptionHandler::report(DBConnectionError)
#23 [internal function]: MWExceptionHandler::handleException(DBConnectionError)
#24 {main}