Problem with action-enable-page-as-extension-node-wp.dynamicui.config

The Exploiting the WebSphere Portal 5.1.0.1 programming model: Part 4: Making your portal dynamic and context sensitive article says that before you create pages you need to create a extension node, which is nothing but a portal page with some special property,

It says that you can use following configuration code to convert a page into extension node

wpsconfig.{bat|sh} enable-page-as-extension-node 
-DPageUniqueName=extensionNode

But it seems that this task was renamed in the WPS 6.1 and you can call it like this

ConfigEngine.sh action-enable-page-as-extension-node-wp.dynamicui.config 
-DPageUniqueName=pageUniqueName

I tried running this task on my WPS 6.1.5 but it always failed so i looked into what is going on and it turns out that this task actually creates a xmlaccess and invokes it for some reason the task was failing so i tried executing the xmlaccess manually and it worked and i was able to mark that page as extension node

<?xml version="1.0" encoding="UTF-8"?>
<request
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="PortalConfig_1.3.xsd"
    type="update"
    create-oids="true">

    <!-- Locate the tpl transformation -->
    <portal action="locate">
        <web-app action="locate" active="true" 
  uid="wps.dynamicui.transformationapp.webmod">
            <transformation-app action="locate" active="true" 
   uid="wps.dynamicui.transformationapp">
                <transformation action="locate" active="true" 
    objectid="theTransformation" name="DynamicUITransformation" >
                </transformation>
            </transformation-app>
        </web-app>

        <!-- Enable page as task page container -->
        <content-node action="update" 
  uniquename="pageUniqueName">
             <transformationinstance action="update" 
    transformationref="theTransformation"/>
        </content-node>
              
    </portal>
</request>