Install Proxmox on the Raspberry Pi 4

I am getting this error: according to this Tutorial https://www.bachmann-lan.de/proxmox-ve-auf-dem-raspberry-pi-4-installieren/ it possible to install Proxmox on raspi4 BU I am getting this BUT I am getting an error most like has something to do with e hostname and IP in / etc / hosts I didn t understand what to do in this step in the Tutorial : "The SSD on the Pi will now boot from USB. Update…