Im trying to add this plugin to my 1.5.1 fresh install, no mods are added to it yet.

It gives me a blank page and in the /logs/ file i find this;

[10-Sep-2013 11:48:17 Europe/Amsterdam] PHP Fatal error: Cannot redeclare zen_create_random_value() (previously declared in /var/www/vhosts/mydomain.com/httpdocs/x/includes/functions/functions_general.php:626) in /var/www/vhosts/mydomain.com/httpdocs/x/includes/functions/password_funcs.php on line 86

Is there a fix available for this? Ive googled on this error and found some other people with the same problem but no solution

Can somebody point me in the right direction to fix this so i can use this awesome plugin ?