[ccnet-user] Help with conditional block

[Zilla]

I'm following the syntax and example here:
http://confluence.public.thoughtworks.org/display/CCNET/Last+Build+Status+Condition

        <conditional>
                <conditions>
                        <lastStatusCondition>
                                <value>Success</value>
                        </lastStatusCondition>
                </conditions>
        </conditional

But CCValidate gives me an "Unused node detected" error. What gives?

Thanks, chris