Joining another samba4 to UCS domain

I’m trying to join another samba4 ( zentyal ) server to UCS samba4 domain but I get this error.

Could not join to domain. The following DNS zones are stored in the main domain partition:,,, <>. This normally happen when the
server is upgraded from Windows Server 2000, and Samba4 will not be able to read these zones. Please, move the zones to
the “DomainDnsZones” or “ForestDnsZones” and try again. Check for
help on how to do that.

Any thought?

Only found this thread with a comparable issue but some points to look at:
Samba: Could not join to domain, main domain partition problem