ant can't work

KK.Frank_at_gmail.com
Date: 01/28/05


Date: 28 Jan 2005 05:48:21 -0800

i download ant1.6.2 bin zip file from apache's site, and followed the
installing manual,
but it always say
Invalid implementation version between Ant core and Ant optional tasks.
core : 1.6.1
 optional: 1.6.2

what's the problem??