Failed to perform adprep

In my lab environment, when I perform "adprep /forestprep" in one of domain controllers which is the schema master, I get the following message.

Adprep was unable to extend the schema.

[Status/Consequence]

The schema master did not complete a replication cycle after the last reboot. The schema master must complete at least one replication cycle before the schema can be extended.

[User Action]

Verify that the schema master is connected to the network and can communicate with other Active Directory Domain Controllers. Use the Sites and Services snap-in to replicate between the schema operations master and at least one replication partner. After replication has succeeded, run adprep again.

Then I perform "repadmin /syncall /Aed" to pull the Active Directory replication from other domain controllers.

After performed active directory replication, I performed "adprep /forestprep" again. Now, the problem has been solved. The Active Directory is updating the schema.

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