Can't locate /sys/class/leds folder

Hey all,

So I followed this paper in order to setup my Beaglebone Black :

But now that I want to try out some simple code (blinking on-board LED), I can’t find the “leds” folder where I can manipulate those LEDs.
There is no “leds” folder inside “/sys/class”.

I tried to find the folder using the find command, but it doesn’t return anything relevant to it.

Where can I find this folder ? Or is there anything to do before accessing it ?

Thanks by advance !

wgd@wgd:~$ uname -a
Linux wgd 4.4.68-ti-r111 #1 SMP Wed Jun 28 10:06:34 UTC 2017 armv7l GNU/Linux
wgd@wgd:~$ ls /sys/class/leds/
beaglebone:green:usr0 beaglebone:green:usr2
beaglebone:green:usr1 beaglebone:green:usr3
wgd@wgd:~$ cat /etc/dogtag Debian Image 2017-07-01

The point is this. If you require something the standard factory images
need. Don't screw around with someone elses build guide, or images. The site has links to all factory, and custom images built by
the same people who build the factory images. Then if you want to get
"crazy, google "eewiki debian on beaglebone black", and Follow Roberts
guide that he uses in part, or whole to build the factory images.