What Is Error Code 2505

All the links I found on the Internet (not very many) for MyCloud error codes seem to be broken or not relevant. My PR4100 threw four or five of these warning since last night. The emails it’s sending have some of their tops cut off it seems.

I suspect it has something to do with a scheduled activity. The only one I scheduled is a virus scan with the app provided. My NAS have 36 TB available but my efforts to transfer all the stuff to it got interrupted by an opportunity to do some paying work so it only has about 5 TB of files on it right now. Seems like it should be able to knock out the initial virus scan overnight but I have no idea what the problem might be.

Anybody?