build failed (using Ant1.6)

hi

i wish to use Ant1.6 but while the deploy process i am getting

the following error

Buildfile: build.xml

init:

prepare:

[mkdir] Created dir: D:\webapplication\sanj\build

[mkdir] Created dir: D:\webapplication\sanj\build\META-INF

[mkdir] Created dir: D:\webapplication\sanj\build\WEB-INF

[mkdir] Created dir: D:\webapplication\sanj\build\WEB-INF\classes

[mkdir] Created dir: D:\webapplication\sanj\build\WEB-INF\lib

build:

[copy] Copying 1 file to D:\webapplication\sanj\build\WEB-INF

[copy] Copying 8 files to D:\webapplication\sanj\build

package:

[echo] Packaging the WAR....

[jar] Building jar: D:\webapplication\sanj\${application}.war

deploy:

BUILD FAILED

D:\webapplication\sanj\build.xml:165: java.io.IOException: Server returned HTTP

response code: 401 for URL: http://localhost:4263/manager/deploy?path=%2F%24%7Ba

pplication%7D

plz help...or provide

any link from where i can get help...

[1042 byte] By [BRAVOa] at [2007-11-27 8:58:03]