Add Second Active Directory In Exist Forest .

Hi ,

I;m Trying to add other Active Directory in mu exist Forest (( As second Child ))

but While the Replication of Installing Active Directory Service i got this Error Message

also From DCpromo logs this error

07/31/2014 12:34:58 [INFO] Replicated the configuration container.

07/31/2014 12:34:58 [INFO] Replicating critical domain information...

07/31/2014 12:34:59 [INFO] EVENTLOG (Warning): NTDS Replication / Replication : 1203

The directory service could not replicate the following object from the source directory service at the following network address because of an Active Directory Domain Services schema mismatch.

07/31/2014 12:34:59 [INFO] Error - Active Directory Domain Services could not replicate the directory partition DC=childdomain,DC=mydomain

,DC=local from the remote Active Directory Domain Controller contosoDC.mydomain.local....