Unison : "File monitoring helper program not running"

English Applications
1

i have more and more difficulties to synchronize my files between laptop and pc because of an error that was not present after i installed 15.2.
But now, every time i try to use unison gui to sync i get this occult message :

“File monitoring helper program not running”

And the gui stops.

But unison cli works very well.

I don’t understand where it comes from.

If i run this command :

unison -debug verbose &

i get this error :


....
(long unrelevant blabla)
....
[fswatch+] << VERSION 1
[fswatch] debugging enabled
[fswatch+] << DEBUG
Fatal error: exception Unix.Unix_error(Unix.EBADF, "set_nonblock", "")
File monitoring helper program not running
<>$Starting new major GC cycle
<>Starting new major GC cycle
!

Any idea of what might cause this and how to avoid that problem ?

Thanks

2

Possibly this?

3

No, it’s not this problem.
The versions of unison are the same on both machines which have 15.2 runing.
The strange point is that it used to run very well when i first installed 15.2, this summer.
But now, suddenly, it keeps on puting this ““File monitoring helper program not running”” error with gui but not cli.