LEDScape pru_unit:44: prussdrv_open failed

I’m following this guide:

but I’m on a Debian with: Linux LEDPIXEL0 3.8.13-bone72 #1 SMP Tue Jun 16 21:36:04 UTC 2015 armv7l GNU/Linux

aptitude update
sudo aptitude update
sudo apt-get install usbmount git build-essential

git clone git://github.com/Yona-Appletree/LEDscape

cd LEDscape

I think problems start here:

sudo cp /boot/dtbs/3.8.13-bone72/am335x-boneblack.dtb{,.preledscape_bk}

sudo cp am335x-boneblack.dtb /boot/dtbs/3.8.13-bone72/
sudo modprobe uio_pruss

sudo emacs /boot/uEnv.txt

added the following line:

##Disable HDMI
cape_disable=capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN

sudo reboot

sudo ./install-service.sh

service ledscape

return unknown

sudo ./run-ledscape