Internal error

Call to undefined method SpecialAbuseFilter::checkPermissions

Backtrace:

#0 /home/kingpin/web/tcorg/wiki/extensions/AbuseFilter/special/SpecialAbuseFilter.php(24): SpecialPage->__call('checkPermission...', Array)
#1 /home/kingpin/web/tcorg/wiki/extensions/AbuseFilter/special/SpecialAbuseFilter.php(24): SpecialAbuseFilter->checkPermissions()
#2 /home/kingpin/web/tcorg/wiki/includes/SpecialPageFactory.php(458): SpecialAbuseFilter->execute(NULL)
#3 /home/kingpin/web/tcorg/wiki/includes/Wiki.php(226): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#4 /home/kingpin/web/tcorg/wiki/includes/Wiki.php(626): MediaWiki->performRequest()
#5 /home/kingpin/web/tcorg/wiki/includes/Wiki.php(533): MediaWiki->main()
#6 /home/kingpin/web/tcorg/wiki/index.php(57): MediaWiki->run()
#7 {main}