A pool size for account-identifiers (RIDs) that was configured by an Administrator is greater than the supported maximum. ...

A pool size for account-identifiers (RIDs) that was configured by an Administrator is greater than the supported maximum. The maximum value of %1 will be used when the domain controller is the RID master. 
See http://go.microsoft.com/fwlink/?LinkId=225963 for more information.