F19:personal file sharing doesn't work

[Antonio M]

when I want to share files in a easy way, I was used to Personal Files 
Sharing.
Now I enabled it on my F19 systems (both in Gnome and Mate) but 
something seems wrong:

When I open Resources/Network I see shares of computers A and B but:

working on A clicking on B I get :
Impossible to mount position
Error HTTP: Cannot connect to destination (PCdesktop.local)

Clicking on A (per quanto abbia senso) I get:
Impossible to mount the position
Error HTTP: Internal Server Error

Same if I work on B

any hint?? googling around didn't give me any clue

Tnx