Message: set times: Operation not permitted

Windows 10
Version 5.15.4 (Build 9849)
Following the transfer of each file i get a message <filename>:set times: Operation not permitted. I then click cancel and it carries on transferring the next file. Could you let me know what is causing the error message please.

It's basically this problem:
https://winscp.net/eng/docs/message_preserve_time_perm