there are only 7 arguments in this code:
$WAFV_Errors .= WAValidateZC(((isset($_POST["postcode"]))?$_POST["postcode"]:"") . "",true,true,true,true,true,9);
add an 8th:
$WAFV_Errors .= WAValidateZC(((isset($_POST["postcode"]))?$_POST["postcode"]:"") . "",true,true,true,true,true,true,9);