Getting Fatal Error when enabling hide mode with Hide Login

When enabling Hide Mode and Hide WP-admin, I get this error.

Fatal error: Call to undefined function check_admin_referer() in /home/christopherc3p0/wearabl.com/wp-content/plugins/hide-login/hide-login.php on line 81

Any ideas?

(this post is categorized under login redirect because i didn't see an option to select hide login in the dropdown)

Thanks!