Problem installing configserver security & firewall

I have a new install of cyberpaney on Ubuntu 20.04 full updated and upgraded. After install and login the first thing I did was go to Security CSF and install. From that screen all went well, however when I then go to ConfigServer Sefvices the ConfigServer Security & Firewall I am met with the follow:
Error The path to iptables is either not set or incorrect for IPTABLES [/sbin/iptables] in /etc/csf/csf.conf at /usr/local/csf/lib/ConfigServer/URLGet.pm line 26. Compilation failed in require at /usr/local/csf/lib/ConfigServer/DisplayUI.pm line 20. BEGIN failed–compilation aborted at /usr/local/csf/lib/ConfigServer/DisplayUI.pm line 20. Compilation failed in require at /usr/local/csf/bin/cyberpanel.pl line 14. BEGIN failed–compilation aborted at /usr/local/csf/bin/cyberpanel.pl line 14.

What have I done incorrectly on the initial install and more importantly how can I avoid it when I reinstall if that is what I need to do.

Thanks in advance