users@glassfish.java.net

I am getting an error while installing glassfish

From: <glassfish_at_javadesktop.org>
Date: Thu, 06 Nov 2008 23:56:58 PST

I am getting "lib\ant\bin\lib\installer-builder not found"
error , can any body sort out this error.I got this error while running the "ant -f setup.xml" command
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