Firewalld: Error: Invalid_Zone

I got some error I can not solve while setting up a default zone in firewalld. I added the interface with firewall-cmd --zone=public --change-interface=ens3 and then I saw the default public zone active. so then I firewall-cmd --reload *error: Command_failed: 'usr/sbin/ip6tables-restore -w -n' failed: ip6tables-restore v1.8.2 (nf_tables): line 4: Rule_Replace faaled (no Such file or directory: rule in chain INPUT" so ip6tables-restore is trying to do something upon restart of firewalld. Yet when I "iptables -L" I get "bash: iptables: command not found. firewall-cmd --list-all *Error: Invalid_zone* But the zone showed moments ago...