delete not working

[Kuriti, Mohan]

Hi Gurus,

I am using the following target in my xml file.
The files are not getting deleted.

<target name="clean1" depends="dist">
    <!-- Delete the ${build} and ${dist} directory trees -->
    <delete dir="${src}/${build}"/>
    <!--delete dir="${dist}" /-->
</target>

Can anybody help please? I am using ant1.2 . 

Thanks in advance
Mohan