This error appears for Agent v3.0.0 and newer and refers to the Reference Agent in a synchronization job
The error message appears on the RW Agents that haven't completed their initial sync with the Reference Agent. before it was removed from the job.
As a result file permissions on those agents remain different from those on the Reference Agent and will be synced back.
There are two ways to resolve the error:
1) Add the Reference Agent back to the job. Edit the job and assign the Reference Agent. This can be one of the RW agents in the job. Other agents will continue leveling their file permissions against the new Reference Agent. Note, it might take long if the difference between the file permissions is big.
2) Stop the initial sync. It is not a preferred solution, but can be used if option 1) is not possible for a reason. Open the Agent's details in the job run and click to stop the initial sync. In this case, file permissions will remain as they were at the moment, and may sync back to other agents.
Error code CE_INITIAL_SYNCING