[PROBLEM] Can't mount exFAT HDD

[Peiote]

Hi

Software
XBian version: 1.0 (knockout) (kernel: Linux 4.4.6+)
XBMC/Kodi version: 16.0 Git:2016-03-11-a3eb4fa
Overclock settings: I didn't overclock it

Hardware
Device type and model: Raspberry Pi 3
Power supply rating: 1,8 Amp
SD card size and make/type: 16 GB
Network (Ethernet or wireless): Ethernet
Connected devices (TV, USB, network storage, ...): Monitor, keyboard

Log files
Link to logfile(s):

Problem description:
I formatted my HDD to exFAT, since it seems to be the best system if you want compatibility and good performance torrenting in linux.

I have installed too the AutoFS package.

But when I plug in the USB, nothing happens (no sda in media using the "df" command, no files in Kodi).
Although on my PC it works fine (not a problem with the cable).

Any other needed information, let me know.

How to reproduce:
An exFAT pendrive is not mounted either.
Same FAT32 formatted pendrive is mounted perfectly.