In my case the DC controllers were out of sync too long. (DC2 was shut down for longer then 60 days. homelab)
after some searching i found that just simply set MaxOfflineTimeInDays greater than the days in the eventlog.
so i used command in elevated command prompt: wmic.exe /namespace:\\root\microsoftdfs path DfsrMachineConfig set MaxOfflineTimeInDays=65
change 65 to the days greater than in the event: for example 300 days
if possible reboot your servers or wait few minutes for a succesful replication
Consider setting the MaxOfflineTimeInDays back to original days of 60