MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query:
select smw_id
from smw_ids
where smw_namespace = 136 and smw_title = 'Висящев_Андрей_Вячеславович'
limit 1

Function:
Error: 2002 Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111) (localhost)
' in /var/www/adminroot/data/www/tadviser.ru/includes/db/Database.php:639
Stack trace:
#0 /var/www/adminroot/data/www/tadviser.ru/includes/db/Database.php(594): Database->reportQueryError('Can't connect t...', 2002, '???select smw_i...', '', false)
#1 /var/www/adminroot/data/www/tadviser.ru/extensions/MainPages/company_tree.php(563): Database->query('???select smw_i...')
#2 /var/www/adminroot/data/www/tadviser.ru/extensions/MainPages/company_tree.php(302): efCTree_getSMWid('??????????????_...')
#3 /var/www/adminroot/data/www/tadviser.ru/extensions/MainPages/company_tree.php(100): efCTree_getParent('??????????????_...')
#4 [internal function]: efCTree_Render(Object(Parser), '')
#5 /var/www/adminroot/data/www/tadviser.ru/includes/parser/Parser.php(3002): call_user_func_array('efCTree_Render', Array)
#6 /var/www/adminroot/data/www/tadviser.ru/includes/parser/Preprocessor_DOM.php(933): Parser->braceSubstitution(Array, Object(PPTemplateFrame_DOM))
#7 /var/www/adminroot/data/www/tadviser.ru/includes/parser/Parser.php(3129): PPFrame_DOM->expand(Object(PPNode_DOM))
#8 /var/www/adminroot/data/www/tadviser.ru/includes/parser/Preprocessor_DOM.php(933): Parser->braceSubstitution(Array, Object(PPFrame_DOM))
#9 /var/www/adminroot/data/www/tadviser.ru/includes/parser/Parser.php(2806): PPFrame_DOM->expand(Object(PPNode_DOM), 0)
#10 /var/www/adminroot/data/www/tadviser.ru/includes/parser/Parser.php(991): Parser->replaceVariables('{{?????????????...')
#11 /var/www/adminroot/data/www/tadviser.ru/includes/parser/Parser.php(327): Parser->internalParse('{{?????????????...')
#12 /var/www/adminroot/data/www/tadviser.ru/includes/Article.php(3465): Parser->parse('{{?????????????...', Object(Title), Object(ParserOptions), true, true, 1407268)
#13 /var/www/adminroot/data/www/tadviser.ru/includes/Article.php(925): Article->outputWikiText('{{?????????????...', false)
#14 /var/www/adminroot/data/www/tadviser.ru/includes/Wiki.php(454): Article->view()
#15 /var/www/adminroot/data/www/tadviser.ru/includes/Wiki.php(63): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#16 /var/www/adminroot/data/www/tadviser.ru/index.php(890): MediaWiki->initialize(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#17 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Unable to free MySQL result' in /var/www/adminroot/data/www/tadviser.ru/includes/db/Database.php:747
Stack trace:
#0 /var/www/adminroot/data/www/tadviser.ru/extensions/SemanticForms/includes/SF_LinkUtils.inc(275): Database->freeResult(false)
#1 /var/www/adminroot/data/www/tadviser.ru/extensions/SemanticForms/includes/SF_LinkUtils.inc(285): SFLinkUtils::getCategoriesForArticle(Object(SkinZdrav))
#2 /var/www/adminroot/data/www/tadviser.ru/extensions/SemanticForms/includes/SF_FormEditTab.php(26): SFLinkUtils::getFormForArticle(Object(SkinZdrav))
#3 [internal function]: SFFormEditTab::displayTab(Object(SkinZdrav), Array)
#4 /var/www/adminroot/data/www/tadviser.ru/includes/Hooks.php(127): call_user_func_array(Array, Array)
#5 /var/www/adminroot/data/www/tadviser.ru/includes/SkinTemplate.php(802): wfRunHooks('SkinTemplateTab...', Array)
#6 /var/www/adminroot/data/www/tadviser.ru/includes/SkinTemplate.php(436): SkinTemplate->buildContentActionUrls()
#7 /var/www/adminroot/data/www/tadviser.ru/includes/OutputPage.php(946): SkinTemplate->outputPage(Object(OutputPage))
#8 /var/www/adminroot/data/www/tadviser.ru/includes/Exception.php(159): OutputPage->output()
#9 /var/www/adminroot/data/www/tadviser.ru/includes/Exception.php(183): MWException->reportHTML()
#10 /var/www/adminroot/data/www/tadviser.ru/includes/Exception.php(269): MWException->report()
#11 /var/www/adminroot/data/www/tadviser.ru/includes/Exception.php(327): wfReportException(Object(DBQueryError))
#12 [internal function]: wfExceptionHandler(Object(DBQueryError))
#13 {main}