can't initialize iptables table `filter': Table does not exist (do you need to insmod?) - iptables is not present

I am trying to install NGINX and Certificate by following this https://phoenixnap.com/kb/how-to-install-nginx-on-ubuntu-20-04#:~:text=1%20How%20to%20Install%20and%20Configure%20Nginx%20on,...%207%20Test%20Nginx.%20...%208%20More%20items link.

But at the Step 5: Allow Nginx Traffic, I am getting error after the command sudo ufw allow 'nginx http'.

The error we are facing is

WARN: initcaps[Errno 2] iptables v1.8.4 (legacy): can't initialize iptables table `filter': Table does not exist (do you need to insmod?)Perhaps iptables or your kernel needs to be upgraded.Skipping adding existing rule

While I listed the files in /etc/modprobe.d I didn't find iptable file

Can anyone help to resolve this.

Tried to install NGINX and SSL