feh ERROR: Can't open X display. It *is* running, yeah?

Followed this tutorial to try and get a photo album running on my raspberry pi 3: https://pimylifeup.com/raspberry-pi-photo-frame/ Using feh to try and run DISPLAY=:0.0 XAUTHORITY=/home/pi/.Xauthority /usr/bin/feh --quiet --preload --randomize --full-screen --reload 60 -Y --slideshow-delay 15.0 /home/pi/Photos-001/ But keep getting the error feh ERROR: Can't open X display. It *is* running, yeah?. I've tried export DISPLAY=:0 but that doesn't seem to have any affect Open to any solutions, or alternatives to feh Running on Raspbian GNU/Linux 11 (bullseye) on a Raspberry Pi 3