HTMLPurifier throws error on HTML.Nofollow configuration

I am using Yii 1.1.7 which ships with HTML Purifier 4.3.0 which supports the HTML.Nofollow directive.

I tried the following:

$p = new CHtmlPurifier();

$p->options = array(



    'http' => true,

    'https' => true,



but it gives me:

Cannot set undefined directive HTML.Nofollow to value on line 1707 in file /[…]/yii/framework/vendors/htmlpurifier/HTMLPurifier.standalone.php

Any help would be appreciated!