Error Msg from meld:

Error copying '/media/root/5FDA03906F33F217/SAVE/rsyncTEST-usb/allusers' to '/run/user/0/gvfs/ftp:host=192.168.0.103/var/ftp/ftpd/images/PersistenceUSBs/rsync-meld/allusers'

[Errno 95] Operation not supported: '/run/user/0/gvfs/ftp:host=192.168.0.103/var/ftp/ftpd/images/PersistenceUSBs/rsync-meld/allusers'.

I encountered the gvfs-fuser issue attempting to use meld/diff/kdiff over ftp.  Seems the problem is between fuser and gvfs.  The problem seems not to occur in 3.15.1 but begins being reported in 3.15.2.(the new python ver?)
Solution is a workaround not a fix - files/directories will copy but error is still displayed.

THE SOLUTION:
https://unix.stackexchange.com/a/77457

One possible solution is using sshfs
https://bugzilla.gnome.org/show_bug.cgi?id=317875#c4
https://peppermintos.net/viewtopic.php?f=35&t=5344

fyi gvfs-commands
https://askubuntu.com/questions/499523/what-is-the-difference-between-gvfs-commands-and-common-commands-like-cat-ls-c

cause:
https://github.com/g2p/bedup/issues/74
https://www.bountysource.com/issues/39167286-cannot-save-to-gvfs-mount
https://www.raditha.com/blog/archives/1749.html


Related Bugs:
https://bugzilla.gnome.org/show_bug.cgi?id=317875
https://bugzilla.gnome.org/show_bug.cgi?id=768281