Internal error

From IHRIS Wiki

[0114c9b1eb678f8f548385bc] /mediawiki/index.php/Special:RequestAccount Error: Call to undefined function wfReadOnly()

Backtrace:

from /var/www/sites-available/mediawiki.1.40.1/extensions-available/ConfirmAccount.20191008/frontend/specialpages/actions/RequestAccount_body.php(38)
#0 /var/www/sites-available/mediawiki.1.40.1/includes/specialpage/SpecialPage.php(701): RequestAccountPage->execute()
#1 /var/www/sites-available/mediawiki.1.40.1/includes/specialpage/SpecialPageFactory.php(1475): SpecialPage->run()
#2 /var/www/sites-available/mediawiki.1.40.1/includes/MediaWiki.php(327): MediaWiki\SpecialPage\SpecialPageFactory->executePath()
#3 /var/www/sites-available/mediawiki.1.40.1/includes/MediaWiki.php(923): MediaWiki->performRequest()
#4 /var/www/sites-available/mediawiki.1.40.1/includes/MediaWiki.php(576): MediaWiki->main()
#5 /var/www/sites-available/mediawiki.1.40.1/index.php(50): MediaWiki->run()
#6 /var/www/sites-available/mediawiki.1.40.1/index.php(46): wfIndexMain()
#7 {main}