Delete the files with FTP or from the terminal app.
"The operation can’t be completed because the item is in use"
Google the above error and see how many people have had this problem *without* a NAS attached, who's to blame there?
Here's a guy with the same problem with a USB drive, should we advise people not to use third party USB drives as well? or the dreaded NetaTalk on those drives, sorry sarcasm.
https://discussions.apple.com/thread/3987969?start=0&tstart=0The OS X Finder is the one denying the delete, why? NASLite squashes all the permissions to the user, NAS-User and all files read/write, and rebooting the OS X machine still results with the "in use" error.
I've been able to reproduce this copying the App Store application to my NL Box and trying to delete it. The Finder delete's most of the App folder then halts with the above error, at that point I went to my terminal program and cd'd to /Volumes/Disk-1 and issued "rm -r App Store.app" and deleted the file.
So, with that, the Finder won't delete the App folder, but the rm command from the OS X CLI will, does this appear to be a NL problem or a Apple problem?