Desktop failure, "module not installed" after Plasma 6.3 update

After installing a new Plasma 6.3 on my arch linux, my desktop shows an error message

file:///home/[MyUserName]/.local/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/main.qml:18:1: module “org.kde.private.desktopcontainment.folder” version 0.1 is not installed

I’ve tried to downgrade my Plasma installation, but it only got worse. Tried to reinstall everything but no luck here neither. So I’m stuck with this error message. I really want to find some kind of solution to this, I really like using KDE Plasma. Hopefully I wont need to reinstall the whole system…

I deleted “Main.qml”, now everything works again.
Lol.