Error with CSF Centos 8.1 installation

Well, nftables didn't appear like yesterday and I see no movement for CSF towards nftables yet.

Since Centos 8 is the first RH based OS having this implemented by default (is that the case, because mine wasn't?) I'm sure there will be some movement in the near future, at least I expect it.

Combined with not only the comfort of CSF but the proven security it already provided in the past and the nice CSF/BFM combo which Zeiter made, keeping CSF with iptables for a little while longer is not only a question of throwing a way a piece of comfort. Nftables can't beat this at the moment for sure because next to this it also needs a new learning curve since the CSF script is not updated yet.

No don't throw away Centos 8, you can't compare OS progress with a smaller firewall progress. Changing to nftables is more like already implementing 7.4 while not all your scripts are 7.4 compatible and having to build completely new scripts instead of waiting for an update.

Next to that, in this case the "no progress" for some time, does no harm at all, in spite of the fact that nftables is better performance wise for example.
For people who only use iptables lines as firewall, yes they can better change to nftables, they have no benefit in waiting.

However, this is a bit of an off-topic discussion, I was merely giving the solution to get CSF/LFD working again.