summary attribute w. replace task not working?

[Aronszajn, Mark]

I want to get a summary of modifications made with a replace task and the
user manual
says there's a summary attribute for the replace task that does just this,
but I use it in my
replace task:
        <!-- Replace Test Target -->
        <target name="replacetest">
                <replace
                        dir="${propSrcDir}"
                        token=":gene"
                        value=":array"
                        includes="gene.properties"
                        summary="yes"/>
        </target>
and I get a complaint from ant saying:

    Buildfile: build.xml

    replacetest:

    BUILD FAILED

    /Array/build.xml:188: Class org.apache.tools.ant.taskdefs.Replace
doesn't support the "summary" attribute

What gives?

Mark Aronszajn
Biocomputing/Shared Resources
Fred Hutchinson Cancer Research Center