"Unknown Host" error when setting up HA

Hi,
I am using build 6503 to setup a HA. When I execute the command as stated in the guide, I got "Unknown Host" exception. I already specified the hostname in the windows hostfile. Any idea?

Apr 30, 2012 12:28:43 PM com.adventnet.authentication.util.AuthUtil <clinit>
INFO: messageDigest instance obtained for MD5 is : MD5 Message Digest from SUN, <initialized>

Apr 30, 2012 12:28:43 PM com.adventnet.passtrix.client.util.ClientUtil <clinit>
INFO: Running in windows
Apr 30, 2012 12:28:43 PM com.adventnet.passtrix.client.util.ClientUtil CreateHAConf
INFO: unknown host
java.net.UnknownHostException: unknown host
    at org.xbill.DNS.Address.lookupHostName(Address.java:243)
    at org.xbill.DNS.Address.getByName(Address.java:268)
    at com.adventnet.passtrix.client.util.ClientUtil.CreateHAConf(ClientUtil.java:2782)
    at com.adventnet.passtrix.client.util.ClientUtil.CreateHAReplicationZip(ClientUtil.java:2700)
    at com.adventnet.passtrix.utils.HAReplicationPack.replicate(HAReplicationPack.java:31)
    at com.adventnet.passtrix.utils.HAReplicationPack.main(HAReplicationPack.java:49)

Thank you