Error on Mac Pro Server

[jamest]

Does anyone know what this error means. The server seems to show this error in the logs in console then the server restarted:

Mac error 12/7/16 10:36:46.455 AM copyprivs[928]: Could not set ACL permissions for /Volumes/Promise Mirror RAID Set/Creative/file name/PRB_6209.NEF, error: Operation not permitted

[gskibum]

Have you verified that the file is not corrupt? Is the error limited to this one file?

[jamest]

There were multiple errors in the logs. I went into the server room and the server was spinning then restarted. Very unusual activity