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Backtrace:

#0 /var/www/knyga/web/w/includes/libs/rdbms/database/DatabaseMySQL.php(134): Wikimedia\Rdbms\Database->newExceptionAfterConnectError()
#1 /var/www/knyga/web/w/includes/libs/rdbms/database/Database.php(268): Wikimedia\Rdbms\DatabaseMySQL->open()
#2 /var/www/knyga/web/w/includes/libs/rdbms/database/DatabaseFactory.php(156): Wikimedia\Rdbms\Database->initConnection()
#3 /var/www/knyga/web/w/includes/filerepo/ForeignDBRepo.php(113): Wikimedia\Rdbms\DatabaseFactory->create()
#4 /var/www/knyga/web/w/includes/filerepo/ForeignDBRepo.php(87): ForeignDBRepo::{closure}()
#5 /var/www/knyga/web/w/includes/filerepo/ForeignDBRepo.php(94): ForeignDBRepo->getPrimaryDB()
#6 /var/www/knyga/web/w/includes/filerepo/file/LocalFile.php(484): ForeignDBRepo->getReplicaDB()
#7 /var/www/knyga/web/w/includes/filerepo/file/LocalFile.php(327): LocalFile->loadFromDB()
#8 /var/www/knyga/web/w/includes/filerepo/file/LocalFile.php(677): LocalFile->loadFromCache()
#9 /var/www/knyga/web/w/includes/filerepo/FileRepo.php(479): LocalFile->load()
#10 /var/www/knyga/web/w/includes/filerepo/RepoGroup.php(145): FileRepo->findFile()
#11 /var/www/knyga/web/w/includes/parser/CoreParserFunctions.php(1146): RepoGroup->findFile()
#12 /var/www/knyga/web/w/includes/parser/Parser.php(3373): CoreParserFunctions::filepath()
#13 /var/www/knyga/web/w/includes/parser/Parser.php(3058): Parser->callParserFunction()
#14 /var/www/knyga/web/w/includes/parser/PPFrame_Hash.php(274): Parser->braceSubstitution()
#15 /var/www/knyga/web/w/includes/parser/PPTemplateFrame_Hash.php(178): PPFrame_Hash->expand()
#16 /var/www/knyga/web/w/includes/parser/PPTemplateFrame_Hash.php(190): PPTemplateFrame_Hash->getNamedArgument()
#17 /var/www/knyga/web/w/includes/parser/Parser.php(3847): PPTemplateFrame_Hash->getArgument()
#18 /var/www/knyga/web/w/includes/parser/PPFrame_Hash.php(291): Parser->argSubstitution()
#19 /var/www/knyga/web/w/includes/parser/Parser.php(3249): PPFrame_Hash->expand()
#20 /var/www/knyga/web/w/includes/parser/PPFrame_Hash.php(274): Parser->braceSubstitution()
#21 /var/www/knyga/web/w/includes/parser/Parser.php(3249): PPFrame_Hash->expand()
#22 /var/www/knyga/web/w/includes/parser/PPFrame_Hash.php(274): Parser->braceSubstitution()
#23 /var/www/knyga/web/w/includes/parser/PPTemplateFrame_Hash.php(98): PPFrame_Hash->expand()
#24 /var/www/knyga/web/w/includes/parser/Parser.php(3246): PPTemplateFrame_Hash->cachedExpand()
#25 /var/www/knyga/web/w/includes/parser/PPFrame_Hash.php(274): Parser->braceSubstitution()
#26 /var/www/knyga/web/w/includes/parser/Parser.php(2890): PPFrame_Hash->expand()
#27 /var/www/knyga/web/w/includes/parser/Parser.php(1544): Parser->replaceVariables()
#28 /var/www/knyga/web/w/includes/parser/Parser.php(651): Parser->internalParse()
#29 /var/www/knyga/web/w/includes/content/WikitextContentHandler.php(420): Parser->parse()
#30 /var/www/knyga/web/w/includes/content/ContentHandler.php(1760): WikitextContentHandler->fillParserOutput()
#31 /var/www/knyga/web/w/includes/content/Renderer/ContentRenderer.php(47): ContentHandler->getParserOutput()
#32 /var/www/knyga/web/w/includes/Revision/RenderedRevision.php(260): MediaWiki\Content\Renderer\ContentRenderer->getParserOutput()
#33 /var/www/knyga/web/w/includes/Revision/RenderedRevision.php(232): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached()
#34 /var/www/knyga/web/w/includes/Revision/RevisionRenderer.php(223): MediaWiki\Revision\RenderedRevision->getSlotParserOutput()
#35 /var/www/knyga/web/w/includes/Revision/RevisionRenderer.php(164): MediaWiki\Revision\RevisionRenderer->combineSlotOutput()
#36 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}()
#37 /var/www/knyga/web/w/includes/Revision/RenderedRevision.php(199): call_user_func()
#38 /var/www/knyga/web/w/includes/poolcounter/PoolWorkArticleView.php(84): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#39 /var/www/knyga/web/w/includes/poolcounter/PoolWorkArticleViewCurrent.php(104): PoolWorkArticleView->renderRevision()
#40 /var/www/knyga/web/w/includes/poolcounter/PoolCounterWork.php(167): PoolWorkArticleViewCurrent->doWork()
#41 /var/www/knyga/web/w/includes/page/ParserOutputAccess.php(304): PoolCounterWork->execute()
#42 /var/www/knyga/web/w/includes/page/Article.php(747): MediaWiki\Page\ParserOutputAccess->getParserOutput()
#43 /var/www/knyga/web/w/includes/page/Article.php(550): Article->generateContentOutput()
#44 /var/www/knyga/web/w/includes/actions/ViewAction.php(78): Article->view()
#45 /var/www/knyga/web/w/includes/MediaWiki.php(583): ViewAction->show()
#46 /var/www/knyga/web/w/includes/MediaWiki.php(363): MediaWiki->performAction()
#47 /var/www/knyga/web/w/includes/MediaWiki.php(960): MediaWiki->performRequest()
#48 /var/www/knyga/web/w/includes/MediaWiki.php(613): MediaWiki->main()
#49 /var/www/knyga/web/w/index.php(50): MediaWiki->run()
#50 /var/www/knyga/web/w/index.php(46): wfIndexMain()
#51 {main}