server 1 (source) is ubuntu 8.04 lts and upgrade zimbra from 5-0.18 To 6-0.1
server 2 (target) is ubuntu 8.04 lts with zimbra (no update) 6-0.1

when i try to move a mailbox with the zmmailbox command i get the following error message on the target server :ERROR: service.FAILURE (system failure: POST failed, status=404 no such item)

With the following command: /opt/zimbra/bin/zmmailbox -z -d -m postRestURL "//fmt=tgz&resolve=reset" /tmp/testname.tgz

testname.tgz is made on the source server and copied to the target with scp command

Any suggestions?