rsync - Nov 2001 - ERROR

I have had rsync set up for 3 years running fine.

suddenly I am getting an error.

@ERROR: Unknown module 'root'

I haven't changed the versions, nor any of the configs, nor the OS.
The module is clearly in there and worked yesterday.

What could be causing this?

rsync v 2.3.1
Solaris 7

[root]
        path = /
        comment = root
        hosts allow = 
        uid = 0
        gid = 0
        auth users = ghddfs 
        secrets file = /etc/rsync.secret