Problem with initiating IBReplicator

[hstijnen]

Hi,

I want to add replication to my database. And trying to do it with IBReplicator.
The first time IBReplicator Manager opens the Configuration databases console and wants me to create new conf db.
For the new configuration I entered:
Server: C:\database\conf1.gdb
User: sysdba

When I click the "save" button I am promted for "New configuration's password". I assume it wants my 'sysdba' password so I entered it. Then I get the following error:
Could not save changes to configuration "New Configuration": A database
error occured.
And in the Details it says: "
Dynamic SQL Error
SQL error code = -204
Table unknown
RELATIONREPLFIELDS"

What is at hand? What can I do?

Thanks for help

Henk