Since the last update no login possible

ā€¦ since the last great update yesterday i cannot login, here the login screen:

ā€¦ in the meantime there was an update in the tty with many errors, what that:

Many thanxxx in advance, i don`t wanna make a fresh install because of some important files on my HDD :sob:

ā€¦ with this i get my normal login-screen back, can login, but now i have a black screen !!!

pacman -S --overwrite "*" kcoreaddons kdbusaddons kwindowsystem kcodecs kconfig kirigami2 kquickimageeditor knotifications ki18n