I am trying to merge a OES2 server into a tree with some already existing OES2 servers in it.

I'm trying:
ndsmerge -m [IP] administrator.target admin.source

I get the error:
Login to target tree as administrator
Error : -634 : DS: ERR_NO_REFERRALS
Attempts to login to the target tree have failed.

Anybody know what I'm doing wrong? Anybody know where I can get a better guide on how to use the CLI for administering OES2?