Terence on "[Plugin: Wordfence Security] Wordfence version: 5.2.6 breaks my site"

PHP: 5.6.1 | mySQL: 5.5.38 | WordPress: 4.0 | PHP Extensions: curl, zlib

I am trying to secure my site but Wordfence version: 5.2.6 breaks the site completely.

When I try to login with Wordfence enabled, I get this...

Warning: Parameter 2 to wordfence::authActionNew() expected to be a reference, value given in /srv/users/serverpilot/apps/wordpress/public/wp-includes/plugin.php on line 505

Warning: Cannot modify header information - headers already sent by (output started at /srv/users/serverpilot/apps/wordpress/public/wp-includes/plugin.php:505) in /srv/users/serverpilot/apps/wordpress/public/wp-includes/pluggable.php on line 913

Warning: Cannot modify header information - headers already sent by (output started at /srv/users/serverpilot/apps/wordpress/public/wp-includes/plugin.php:505) in /srv/users/serverpilot/apps/wordpress/public/wp-includes/pluggable.php on line 914

Warning: Cannot modify header information - headers already sent by (output started at /srv/users/serverpilot/apps/wordpress/public/wp-includes/plugin.php:505) in /srv/users/serverpilot/apps/wordpress/public/wp-includes/pluggable.php on line 915

Warning: session_regenerate_id(): Cannot regenerate session id - headers already sent in /srv/users/serverpilot/apps/wordpress/public/wp-content/plugins/cm-answers/lib/controllers/BaseController.php on line 69

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /srv/users/serverpilot/apps/wordpress/public/wp-includes/plugin.php:505) in /srv/users/serverpilot/apps/wordpress/public/wp-content/plugins/cm-answers/lib/controllers/BaseController.php on line 48

Warning: Cannot modify header information - headers already sent by (output started at /srv/users/serverpilot/apps/wordpress/public/wp-includes/plugin.php:505) in /srv/users/serverpilot/apps/wordpress/public/wp-includes/pluggable.php on line 1173

How/can I fix this?

https://wordpress.org/plugins/wordfence/