nftables service is failing with /etc/nftables.conf: example ipv4 provided in wiki

[CyberBaguette]

I am running raspberry pi 4 (raspbian) :
root@raspberrypi:/etc/nftables/geo-nft/backup_nftables# cat /etc/os-release PRETTY_NAME="Debian GNU/Linux 12 (bookworm)" NAME="Debian GNU/Linux" VERSION_ID="12" VERSION="12 (bookworm)" VERSION_CODENAME=bookworm ID=debian HOME_URL="https://www.debian.org/" SUPPORT_URL="https://www.debian.org/support" BUG_REPORT_URL="https://bugs.debian.org/"

First problem, is that it seems that the nftables are not installed on the correct path if it is compared to the template provided.

Here is the original /etc/nftables.conf of the system, check the shebang :
`#!/usr/sbin/nft -f

flush ruleset

table inet filter {
chain input {
type filter hook input priority filter;
}
chain forward {
type filter hook forward priority filter;
}
chain output {
type filter hook output priority filter;
}
}
`

Even if I take your example as is : https://github.com/wirefalls/geo-nft/wiki/Example-IPv4#example-ipv4-only-nftables-firewall-ruleset

And that I just change the shebang to the expected (#!/usr/sbin/nft -finstead of the #!/usr/bin/nft -f that doesn't exist on my system), I get the error :
Aug 03 00:54:43 raspberrypi nft[64542]: /etc/nftables.conf:16:9-15: Error: Could not process rule: No such file or directory Aug 03 00:54:43 raspberrypi nft[64542]: chain ingress { Aug 03 00:54:43 raspberrypi nft[64542]: ^^^^^^^ Aug 03 00:54:43 raspberrypi nft[64542]: /etc/nftables.conf:16:9-15: Error: Could not process rule: No such file or directory Aug 03 00:54:43 raspberrypi nft[64542]: chain ingress { Aug 03 00:54:43 raspberrypi nft[64542]: ^^^^^^^ Aug 03 00:54:43 raspberrypi systemd[1]: nftables.service: Main process exited, code=exited, status=1/FAILURE Aug 03 00:54:43 raspberrypi systemd[1]: nftables.service: Failed with result 'exit-code'. Aug 03 00:54:44 raspberrypi systemd[1]: Failed to start nftables.service - nftables.

Here is the details when I install the latest version :

/usr/sbin/nft -v

nftables v1.0.6 (Lester Gooch #5)

Any clue what is happening?

Thank you.

[CyberBaguette]

Because you forgot to rename the device_name in the template provided, duh.