Like most build servers, Anthill's current working directory is the directory you kicked off your build server in, not nessesarily the directory your build.xml is located in. So don't use relative paths in your build.xml, always prepend ${basedir} to the begining.
<property name="web.home" value="web/WEB_INF"/>
should be
<property name="web.home" value="${basedir}/web/WEB_INF"/>
Note: Some tasks seem to prepend basedir automatically on to the front of your paths(?), but others don't, which makes this hard to track down.
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