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Backtrace:

#0 /var/www/knyga/web/w/includes/libs/rdbms/database/DatabaseMysqlBase.php(135): Wikimedia\Rdbms\Database->newExceptionAfterConnectError()
#1 /var/www/knyga/web/w/includes/libs/rdbms/database/Database.php(280): Wikimedia\Rdbms\DatabaseMysqlBase->open()
#2 /var/www/knyga/web/w/includes/libs/rdbms/database/Database.php(263): Wikimedia\Rdbms\Database->doInitConnection()
#3 /var/www/knyga/web/w/includes/libs/rdbms/database/DatabaseFactory.php(121): Wikimedia\Rdbms\Database->initConnection()
#4 /var/www/knyga/web/w/includes/filerepo/ForeignDBRepo.php(113): Wikimedia\Rdbms\DatabaseFactory->create()
#5 /var/www/knyga/web/w/includes/filerepo/ForeignDBRepo.php(87): ForeignDBRepo::{closure}()
#6 /var/www/knyga/web/w/includes/filerepo/ForeignDBRepo.php(94): ForeignDBRepo->getPrimaryDB()
#7 /var/www/knyga/web/w/includes/filerepo/file/LocalFile.php(511): ForeignDBRepo->getReplicaDB()
#8 /var/www/knyga/web/w/includes/filerepo/file/LocalFile.php(354): LocalFile->loadFromDB()
#9 /var/www/knyga/web/w/includes/filerepo/file/LocalFile.php(726): LocalFile->loadFromCache()
#10 /var/www/knyga/web/w/includes/filerepo/FileRepo.php(477): LocalFile->load()
#11 /var/www/knyga/web/w/includes/filerepo/RepoGroup.php(145): FileRepo->findFile()
#12 /var/www/knyga/web/w/includes/parser/Parser.php(3803): RepoGroup->findFile()
#13 /var/www/knyga/web/w/includes/parser/Parser.php(3769): Parser->fetchFileNoRegister()
#14 /var/www/knyga/web/w/includes/parser/Parser.php(5332): Parser->fetchFileAndTitle()
#15 /var/www/knyga/web/w/includes/parser/Parser.php(2697): Parser->makeImage()
#16 /var/www/knyga/web/w/includes/parser/Parser.php(2441): Parser->handleInternalLinks2()
#17 /var/www/knyga/web/w/includes/parser/Parser.php(1616): Parser->handleInternalLinks()
#18 /var/www/knyga/web/w/includes/parser/Parser.php(700): Parser->internalParse()
#19 /var/www/knyga/web/w/extensions/ProofreadPage/includes/Index/IndexContentHandler.php(573): Parser->parse()
#20 /var/www/knyga/web/w/includes/content/ContentHandler.php(1748): ProofreadPage\Index\IndexContentHandler->fillParserOutput()
#21 /var/www/knyga/web/w/includes/content/Renderer/ContentRenderer.php(47): ContentHandler->getParserOutput()
#22 /var/www/knyga/web/w/includes/Revision/RenderedRevision.php(260): MediaWiki\Content\Renderer\ContentRenderer->getParserOutput()
#23 /var/www/knyga/web/w/includes/Revision/RenderedRevision.php(232): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached()
#24 /var/www/knyga/web/w/includes/Revision/RevisionRenderer.php(227): MediaWiki\Revision\RenderedRevision->getSlotParserOutput()
#25 /var/www/knyga/web/w/includes/Revision/RevisionRenderer.php(164): MediaWiki\Revision\RevisionRenderer->combineSlotOutput()
#26 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}()
#27 /var/www/knyga/web/w/includes/Revision/RenderedRevision.php(199): call_user_func()
#28 /var/www/knyga/web/w/includes/poolcounter/PoolWorkArticleView.php(87): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#29 /var/www/knyga/web/w/includes/poolcounter/PoolWorkArticleViewCurrent.php(92): PoolWorkArticleView->renderRevision()
#30 /var/www/knyga/web/w/includes/poolcounter/PoolCounterWork.php(166): PoolWorkArticleViewCurrent->doWork()
#31 /var/www/knyga/web/w/includes/page/ParserOutputAccess.php(299): PoolCounterWork->execute()
#32 /var/www/knyga/web/w/includes/page/Article.php(735): MediaWiki\Page\ParserOutputAccess->getParserOutput()
#33 /var/www/knyga/web/w/includes/page/Article.php(545): Article->generateContentOutput()
#34 /var/www/knyga/web/w/includes/actions/ViewAction.php(78): Article->view()
#35 /var/www/knyga/web/w/includes/MediaWiki.php(556): ViewAction->show()
#36 /var/www/knyga/web/w/includes/MediaWiki.php(333): MediaWiki->performAction()
#37 /var/www/knyga/web/w/includes/MediaWiki.php(923): MediaWiki->performRequest()
#38 /var/www/knyga/web/w/includes/MediaWiki.php(576): MediaWiki->main()
#39 /var/www/knyga/web/w/index.php(50): MediaWiki->run()
#40 /var/www/knyga/web/w/index.php(46): wfIndexMain()
#41 {main}