DSRepair error -722

Hi,

I have a Netware server that does not want to load DS very well.
When I try to run dsrepair with ds.nlm loaded, I get -785 (indicating DB corruption)

I started the server with -NDB to prevent the eDirectory from loading.
I try to run DSrepair -A to repair the local database, but I get the error:

ERROR: Unable to properly initialize the schema ID table.
Error: -722

How should I proceed?
Kind regards,
Arjan