Yes, of course I use a custom theme, and I have the latest version of IPS and the latest version of IPS uses php 8.0, the theme is made to be sure on version below 4.6 I did a search on the internet last night, but I have no idea how to change the theme to be compatible
I also installed the default theme from IPS and the plugin still doesn't work, I don't know exactly what I should do.