install ionCube loader for PHP 8.1.2 and Ubuntu 22.04

I have a Ubuntu server 22.04 and I have installed PHP 8.1.2, MySQL 8, and Apache2 then I installed WordPress’s latest version. I did this introduction (Link)
After I installed and enabled the new theme (Harika) I got the “ionCube PHP loader needs to be installed”

Then I did Everything that is on this (Link) page to fix the error, but when I browse the WordPress home page I get HTTP ERROR 500 (This page isn’t working).

Please help me.
Thanks.