Hi @kolohe280, thanks for raising this. Backlight 6 strives to be compatible with PHP 8.5 - it’s updated according to the documentation and I run 8.5 for my development.
I’ll look into this to see what might have been missed.
Hi @kolohe280, are you still able to use the Backlight Modules page, or does this error prevent it from loading? If you are able to, then a simple update from us should be able to fix it without you needing to manually update and re-run the installer.