I’m having the same issue now with at least a dozen clients’ sites, on different webhosts from godaddy managed wordpress, to dreamhost, hostgator etc.
All the sites are running the latest WP core and the latest Wordfence, and i’ve tried all the fixes noted above, deleting rules.php, deleting and re-installing Wordfence etc, and no luck at all with any of them.
yes, that’s exactly the same error i’m getting on all my clients sites. so far i’ve had to disable it on about 20 sites 🙁
Fatal error: Cannot redeclare get_language_attributes() (previously declared in /wp-includes/general-template.php:2624) in //wp-content/plugins/wp-ban/wp-ban.php on line 249
