MediaWiki internal error.

Original exception: [bafec490] /index.php/Special:Upload Exception from line 153 of /home/dfwikic/public_html/wikis/includes/specials/SpecialUpload.php:
Backtrace:
#0 /home/dfwikic/public_html/wikis/includes/SpecialPage.php(631): SpecialUpload->execute(NULL)
#1 /home/dfwikic/public_html/wikis/includes/SpecialPageFactory.php(488): SpecialPage->run(NULL)
#2 /home/dfwikic/public_html/wikis/includes/Wiki.php(298): SpecialPageFactory::executePath(Title, RequestContext)
#3 /home/dfwikic/public_html/wikis/includes/Wiki.php(602): MediaWiki->performRequest()
#4 /home/dfwikic/public_html/wikis/includes/Wiki.php(467): MediaWiki->main()
#5 /home/dfwikic/public_html/wikis/index.php(53): MediaWiki->run()
#6 {main}

Exception caught inside exception handler: [5a5ad1e9] /index.php/Special:Upload Exception from line 888 of /home/dfwikic/public_html/wikis/includes/db/Database.php: DB connection error: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111) (localhost)
Backtrace:
#0 /home/dfwikic/public_html/wikis/includes/db/DatabaseMysqlBase.php(96): DatabaseBase->reportConnectionError(string)
#1 /home/dfwikic/public_html/wikis/includes/db/DatabaseMysqlBase.php(497): DatabaseMysqlBase->open(string, string, string, string)
#2 /home/dfwikic/public_html/wikis/includes/db/Database.php(1022): DatabaseMysqlBase->ping()
#3 /home/dfwikic/public_html/wikis/includes/db/Database.php(1496): DatabaseBase->query(string, string)
#4 /home/dfwikic/public_html/wikis/includes/db/Database.php(1585): DatabaseBase->select(string, array, array, string, array, array)
#5 /home/dfwikic/public_html/wikis/includes/cache/LocalisationCache.php(1097): DatabaseBase->selectRow(string, array, array, string)
#6 /home/dfwikic/public_html/wikis/includes/cache/LocalisationCache.php(379): LCStore_DB->get(string, string)
#7 /home/dfwikic/public_html/wikis/includes/cache/LocalisationCache.php(281): LocalisationCache->loadSubitem(string, string, string)
#8 /home/dfwikic/public_html/wikis/languages/Language.php(2337): LocalisationCache->getSubitem(string, string, string)
#9 /home/dfwikic/public_html/wikis/includes/cache/MessageCache.php(802): Language->getMessage(string)
#10 /home/dfwikic/public_html/wikis/includes/cache/MessageCache.php(729): MessageCache->getMessageFromFallbackChain(Language, string, string, boolean)
#11 /home/dfwikic/public_html/wikis/includes/Message.php(878): MessageCache->get(string, boolean, Language)
#12 /home/dfwikic/public_html/wikis/includes/Message.php(689): Message->fetchMessage()
#13 /home/dfwikic/public_html/wikis/includes/Skin.php(1299): Message->exists()
#14 /home/dfwikic/public_html/wikis/includes/Skin.php(1249): Skin->addToSidebarPlain(array, string)
#15 /home/dfwikic/public_html/wikis/includes/Skin.php(1229): Skin->addToSidebar(array, string)
#16 /home/dfwikic/public_html/wikis/includes/SkinTemplate.php(493): Skin->buildSidebar()
#17 /home/dfwikic/public_html/wikis/includes/OutputPage.php(2078): SkinTemplate->outputPage()
#18 /home/dfwikic/public_html/wikis/includes/Exception.php(407): OutputPage->output()
#19 /home/dfwikic/public_html/wikis/includes/Exception.php(606): PermissionsError->report()
#20 /home/dfwikic/public_html/wikis/includes/Exception.php(678): MWExceptionHandler::report(PermissionsError)
#21 /home/dfwikic/public_html/wikis/includes/Wiki.php(470): MWExceptionHandler::handle(PermissionsError)
#22 /home/dfwikic/public_html/wikis/index.php(53): MediaWiki->run()
#23 {main}