openvpn not starting: Extension MASQUERADE revision 0 not supported

[rspring]

When starting openvpn-ui from scratch, both containers are created, but the openvpn container keeps restarting. When I select Configuration > OpenVPN Server, I got a blank page. In the log file of the openvpn container I see:

net.ipv4.ip_forward = 1 net.ipv4.ip_forward = 1 net.ipv4.ip_forward = 1 net.ipv4.ip_forward = 1 Configuring iptables... NAT for OpenVPN clients Warning: Extension MASQUERADE revision 0 not supported, missing kernel module? iptables v1.8.10 (nf_tables): Could not fetch rule set generation id: Invalid argument

Is this a known issue, is there a workaround? Thanks for helping out