It works, then it fails to function after clicking to test for filters. I get the white page.

I am getting the following error message:
[22-Feb-2013 21:50:56] PHP Fatal error: Cannot redeclare zen_create_random_value() (previously declared in
/home/content/******/html/****/cart/includes/functions/functions_general.php:626) in
/home/content/******/html/****/cart/includes/functions/password_funcs.php on line 86
Any idea where it's coming from?