Database error

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

[166eb1c5f69dfe6320b5fad3] /Special:ProblemChanges Wikimedia\Rdbms\DBQueryError from line 1506 of /var/www/gwart.co.uk/mediawiki/includes/libs/rdbms/database/Database.php: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading?
Query: SELECT DISTINCT(ct_tag) FROM `revision`,`change_tag` WHERE rev_page = '610' AND (rev_id > 1175) AND (rev_id = ct_rev_id)
Function: ProblemChanges::getChangeTags
Error: 1054 Unknown column 'ct_tag' in 'field list' (localhost)

Backtrace:

#0 /var/www/gwart.co.uk/mediawiki/includes/libs/rdbms/database/Database.php(1476): Wikimedia\Rdbms\Database->makeQueryException(string, integer, string, string)
#1 /var/www/gwart.co.uk/mediawiki/includes/libs/rdbms/database/Database.php(1236): Wikimedia\Rdbms\Database->reportQueryError(string, integer, string, string, boolean)
#2 /var/www/gwart.co.uk/mediawiki/includes/libs/rdbms/database/Database.php(1703): Wikimedia\Rdbms\Database->query(string, string)
#3 /var/www/gwart.co.uk/mediawiki/extensions/FlaggedRevs/frontend/specialpages/reports/ProblemChanges_body.php(279): Wikimedia\Rdbms\Database->select(array, string, array, string)
#4 /var/www/gwart.co.uk/mediawiki/extensions/FlaggedRevs/frontend/specialpages/reports/ProblemChanges_body.php(216): ProblemChanges::getChangeTags(integer, string)
#5 /var/www/gwart.co.uk/mediawiki/extensions/FlaggedRevs/frontend/specialpages/reports/ProblemChanges_body.php(328): ProblemChanges->formatRow(stdClass)
#6 /var/www/gwart.co.uk/mediawiki/includes/pager/IndexPager.php(446): ProblemChangesPager->formatRow(stdClass)
#7 /var/www/gwart.co.uk/mediawiki/extensions/FlaggedRevs/frontend/specialpages/reports/ProblemChanges_body.php(96): IndexPager->getBody()
#8 /var/www/gwart.co.uk/mediawiki/extensions/FlaggedRevs/frontend/specialpages/reports/ProblemChanges_body.php(42): ProblemChanges->showPageList()
#9 /var/www/gwart.co.uk/mediawiki/includes/specialpage/SpecialPage.php(569): ProblemChanges->execute(NULL)
#10 /var/www/gwart.co.uk/mediawiki/includes/specialpage/SpecialPageFactory.php(558): SpecialPage->run(NULL)
#11 /var/www/gwart.co.uk/mediawiki/includes/MediaWiki.php(288): MediaWiki\Special\SpecialPageFactory->executePath(Title, RequestContext)
#12 /var/www/gwart.co.uk/mediawiki/includes/MediaWiki.php(862): MediaWiki->performRequest()
#13 /var/www/gwart.co.uk/mediawiki/includes/MediaWiki.php(517): MediaWiki->main()
#14 /var/www/gwart.co.uk/mediawiki/index.php(42): MediaWiki->run()
#15 {main}