Error with 'systemctl start firewalld'

Hi list, I've compiled and installed firewalld-0.7.0 on my linux system (linux-4.20.12), with no obvious errors during the built. When I start firewalld with # systemctl start firewalld I get # systemctl status firewalld ERROR: '/sbin/nft add chain ip6 firewalld nat_PREROUTING { type nat hook prerouting priority -90 ; }' failed: Error: Could not process rule: No such file or directory When I inspect the nft tables afterwards, I get # nft list tables table inet firewalld table ip firewalld table ip6 firewalld # nft list table inet firewalld table inet firewalld {    chain raw_PREROUTING {       type filter hook prerouting priority raw + 10; policy accept;    }    chain mangle_PREROUTING {       type filter hook prerouting priority mangle + 10; policy accept;    } } # nft list table ip firewalld table ip firewalld {    chain nat_PREROUTING {       type nat hook prerouting priority dstnat + 10; policy accept;    }    chain nat_POSTROUTING {       type nat hook postrouting priority srcnat + 10; policy accept;    } } # nft list table ip6 firewalld table ip6 firewalld { } What is the problem here? nft seems to be working to some degree, but for some reason the ip6 table is not created. Thanks a lot, Hans