#150 Failed to encrypt file

I created a folder pair and sync with the options: encrypt filenames, use gpg and mirror folder.
Original folderexists to unc path to my nas system. Encrypted folder is local.
First sync was fine, but when I copy new files to my nas cryptsync can not encrypt it with only error message:
Failed to encrypt file

[Anonymous]

I should notice that the os is Windows 10.