Database error

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A database query error has occurred. This may indicate a bug in the software.

[bc4be5e8f1a35a6b572ea3c1] /wiki/index.php?title=C13&diff=prev&oldid=758 Wikimedia\Rdbms\DBQueryError: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading or after adding a new extension?

Please see https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Upgrading and https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:How_to_debug for more information.

Error 1054: Unknown column 'iw_api' in 'field list'
Function: MediaWiki\Interwiki\ClassicInterwikiLookup::load
Query: SELECT iw_prefix,iw_url,iw_api,iw_wikiid,iw_local,iw_trans FROM `interwiki` WHERE iw_prefix = 'end' LIMIT 1

Backtrace:

from /var/www/html/altgothic.com/public_html/wiki/includes/libs/rdbms/database/Database.php(1618)
#0 /var/www/html/altgothic.com/public_html/wiki/includes/libs/rdbms/database/Database.php(1602): Wikimedia\Rdbms\Database->getQueryException()
#1 /var/www/html/altgothic.com/public_html/wiki/includes/libs/rdbms/database/Database.php(1576): Wikimedia\Rdbms\Database->getQueryExceptionAndLog()
#2 /var/www/html/altgothic.com/public_html/wiki/includes/libs/rdbms/database/Database.php(952): Wikimedia\Rdbms\Database->reportQueryError()
#3 /var/www/html/altgothic.com/public_html/wiki/includes/libs/rdbms/database/Database.php(1711): Wikimedia\Rdbms\Database->query()
#4 /var/www/html/altgothic.com/public_html/wiki/includes/libs/rdbms/database/Database.php(1720): Wikimedia\Rdbms\Database->select()
#5 /var/www/html/altgothic.com/public_html/wiki/includes/libs/rdbms/database/DBConnRef.php(103): Wikimedia\Rdbms\Database->selectRow()
#6 /var/www/html/altgothic.com/public_html/wiki/includes/libs/rdbms/database/DBConnRef.php(344): Wikimedia\Rdbms\DBConnRef->__call()
#7 /var/www/html/altgothic.com/public_html/wiki/includes/interwiki/ClassicInterwikiLookup.php(278): Wikimedia\Rdbms\DBConnRef->selectRow()
#8 /var/www/html/altgothic.com/public_html/wiki/includes/libs/objectcache/wancache/WANObjectCache.php(1689): MediaWiki\Interwiki\ClassicInterwikiLookup->MediaWiki\Interwiki\{closure}()
#9 /var/www/html/altgothic.com/public_html/wiki/includes/libs/objectcache/wancache/WANObjectCache.php(1522): WANObjectCache->fetchOrRegenerate()
#10 /var/www/html/altgothic.com/public_html/wiki/includes/interwiki/ClassicInterwikiLookup.php(285): WANObjectCache->getWithSetCallback()
#11 /var/www/html/altgothic.com/public_html/wiki/includes/interwiki/ClassicInterwikiLookup.php(168): MediaWiki\Interwiki\ClassicInterwikiLookup->load()
#12 /var/www/html/altgothic.com/public_html/wiki/includes/libs/MapCacheLRU.php(274): MediaWiki\Interwiki\ClassicInterwikiLookup->MediaWiki\Interwiki\{closure}()
#13 /var/www/html/altgothic.com/public_html/wiki/includes/interwiki/ClassicInterwikiLookup.php(174): MapCacheLRU->getWithSetCallback()
#14 /var/www/html/altgothic.com/public_html/wiki/includes/interwiki/ClassicInterwikiLookup.php(144): MediaWiki\Interwiki\ClassicInterwikiLookup->fetch()
#15 /var/www/html/altgothic.com/public_html/wiki/includes/title/MediaWikiTitleCodec.php(438): MediaWiki\Interwiki\ClassicInterwikiLookup->isValidInterwiki()
#16 /var/www/html/altgothic.com/public_html/wiki/includes/Title.php(2985): MediaWikiTitleCodec->splitTitleString()
#17 /var/www/html/altgothic.com/public_html/wiki/includes/Title.php(432): Title->secureAndSplit()
#18 /var/www/html/altgothic.com/public_html/wiki/includes/Title.php(380): Title::newFromTextThrow()
#19 /var/www/html/altgothic.com/public_html/wiki/includes/parser/Parser.php(2604): Title::newFromText()
#20 /var/www/html/altgothic.com/public_html/wiki/includes/parser/Parser.php(2458): Parser->handleInternalLinks2()
#21 /var/www/html/altgothic.com/public_html/wiki/includes/parser/Parser.php(1639): Parser->handleInternalLinks()
#22 /var/www/html/altgothic.com/public_html/wiki/includes/parser/Parser.php(724): Parser->internalParse()
#23 /var/www/html/altgothic.com/public_html/wiki/includes/content/WikitextContentHandler.php(301): Parser->parse()
#24 /var/www/html/altgothic.com/public_html/wiki/includes/content/ContentHandler.php(1721): WikitextContentHandler->fillParserOutput()
#25 /var/www/html/altgothic.com/public_html/wiki/includes/content/Renderer/ContentRenderer.php(47): ContentHandler->getParserOutput()
#26 /var/www/html/altgothic.com/public_html/wiki/includes/Revision/RenderedRevision.php(266): MediaWiki\Content\Renderer\ContentRenderer->getParserOutput()
#27 /var/www/html/altgothic.com/public_html/wiki/includes/Revision/RenderedRevision.php(237): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached()
#28 /var/www/html/altgothic.com/public_html/wiki/includes/Revision/RevisionRenderer.php(221): MediaWiki\Revision\RenderedRevision->getSlotParserOutput()
#29 /var/www/html/altgothic.com/public_html/wiki/includes/Revision/RevisionRenderer.php(158): MediaWiki\Revision\RevisionRenderer->combineSlotOutput()
#30 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}()
#31 /var/www/html/altgothic.com/public_html/wiki/includes/Revision/RenderedRevision.php(199): call_user_func()
#32 /var/www/html/altgothic.com/public_html/wiki/includes/poolcounter/PoolWorkArticleView.php(91): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#33 /var/www/html/altgothic.com/public_html/wiki/includes/poolcounter/PoolWorkArticleViewOld.php(66): PoolWorkArticleView->renderRevision()
#34 /var/www/html/altgothic.com/public_html/wiki/includes/poolcounter/PoolCounterWork.php(162): PoolWorkArticleViewOld->doWork()
#35 /var/www/html/altgothic.com/public_html/wiki/includes/page/ParserOutputAccess.php(299): PoolCounterWork->execute()
#36 /var/www/html/altgothic.com/public_html/wiki/includes/page/WikiPage.php(1291): MediaWiki\Page\ParserOutputAccess->getParserOutput()
#37 /var/www/html/altgothic.com/public_html/wiki/includes/diff/DifferenceEngine.php(1063): WikiPage->getParserOutput()
#38 /var/www/html/altgothic.com/public_html/wiki/includes/diff/DifferenceEngine.php(1016): DifferenceEngine->getParserOutput()
#39 /var/www/html/altgothic.com/public_html/wiki/includes/diff/DifferenceEngine.php(846): DifferenceEngine->renderNewRevision()
#40 /var/www/html/altgothic.com/public_html/wiki/includes/page/Article.php(908): DifferenceEngine->showDiffPage()
#41 /var/www/html/altgothic.com/public_html/wiki/includes/page/Article.php(465): Article->showDiffPage()
#42 /var/www/html/altgothic.com/public_html/wiki/includes/actions/ViewAction.php(78): Article->view()
#43 /var/www/html/altgothic.com/public_html/wiki/includes/MediaWiki.php(542): ViewAction->show()
#44 /var/www/html/altgothic.com/public_html/wiki/includes/MediaWiki.php(322): MediaWiki->performAction()
#45 /var/www/html/altgothic.com/public_html/wiki/includes/MediaWiki.php(904): MediaWiki->performRequest()
#46 /var/www/html/altgothic.com/public_html/wiki/includes/MediaWiki.php(562): MediaWiki->main()
#47 /var/www/html/altgothic.com/public_html/wiki/index.php(50): MediaWiki->run()
#48 /var/www/html/altgothic.com/public_html/wiki/index.php(46): wfIndexMain()
#49 {main}