For PHP 8 you need version 2.4 of the module.
Is you Icinga Web 2 on at least v2.9 so that it meets the requirements of the module?
Did you try a cache refresh of the page (Ctrl+F5 or Ctrl+Shift+R)?
Hi bro I have tried this But the UI keeps on breaking after enablement of module. I am using RHEL 8 as a base OS and on top of that i have installed Icinga web2 2.9.5. Since the version more than 2.9.5 is available in RHEL repository of icinga which they have provided. So please guide me what to do seriously I am in a pickle regarding this situation and i need to enable the business module so thats why its a request that if you can help me in this.